Parker, R.S. and Pettijohn, C.E. (2003) Ethical Conditions in the Use of Direct-To-Consumer Advertising and Pharmaceutical Promotions: The Impact on Pharmaceutical Sales and Physicians. Journal of Business Ethics, 48, 279-290.
 Handa, M., Vohra, A. and Srivastava, V. (2013) Perception of Physicians towards Pharmaceutical Promotion in India. Journal of Medical Marketing: Device, Diagnostic and Pharmaceutical Marketing, 13, 82-92.
 Caudill, T.S., Johnson, M.S., Rich, E.C. and McKinney, W.P. (1996) Physicians, Pharmaceutical Sales Representatives, and the Cost of Prescribing. Archives of Family Medicine, 5, 201-206. http://dx.doi.org/10.1001/archfami.5.4.201
 Schramm, J., Andersen, M., Vach, K., Kragstup, J., Kampmann, J.P. and Ondergaard, J.S. (2007) Promotional Methods Used by Representatives of Drug Companies: A Prospective Survey in General Practice. Scandinavian Journal of Primary Health Care, 25, 93-97. http://dx.doi.org/10.1080/02813430701339659
 Davis, M. (1982) Conflict of Interest. Business and Professional Ethics Journal, 1, 17-27.
 Redelmeier, D.A. (2009) On the Psychology of Pharmaceutical Industry Gifts to Physicians. Journal of General Internal Medicine, 25, 7-8.
 Strang, D., Gagnon, M., Molloy, W., Bedard, M., Darzins, P., Etchells, E., et al. (1996) National Survey on the Attitudes of Canadian Physicians towards Drug-Detailing by Pharmaceutical Representatives. Annals (Royal College of Physicians and Surgeons of Canada), 29, 474-478.
 Al-Areefi, M.A., Hassali, M.A. and Ibrahim, M.I.B.M. (2013) Physicians’ Perceptions of Medical Representative Visits in Yemen: A Qualitative Study. BMC Health Services Research, 13, 331.
 Alssageer, M.A. and Kowalski, S.R. (2012) A Survey of Pharmaceutical Company Representative Interactions with Doctors in Libya. Libyan Journal of Medicine, 7, 18556. http://dx.doi.org/10.3402/ljm.v7i0.18556
 Ben Abdelaziz, A., Harrabi, I., Rahmani, S., Ghedira, A., Gaha, K. and Ghannem, H. (2003) Attitudes of General Practitioners to Pharmaceutical Sales Representatives in Sousse. Eastern Mediterranean Health Journal, 9, 1075-1083.
 Vancelik, S., Beyhun, N.E., Acemoglu, H. and Calikoglu, O. (2007) Impact of Pharmaceutical Promotion on Prescribing Decisions of General Practitioners in Eastern Turkey. BMC Public Health, 25, 122.
 Williams, P.A., Cockerill, R. and Lowy, F.H. (1995) The Physician as Prescriber: Relations between Knowledge about Prescription Drugs, Encounters with Patients and the Pharmaceutical Industry, and Prescription Volume. Health and Canadian Society, 3, 135-166.
 Moynihan, R. (2003) Who Pays for the Pizza? Redefining the Relationships between Doctors and Drug Companies. 1: Entanglement. BMJ, 326, 1189-1192. http://dx.doi.org/10.1136/bmj.326.7400.1189
 Brett, A.S., Burr, W. and Moloo, J. (2003) Are Gifts from Pharmaceutical Companies Ethically Problematic? A Survey of Physicians. Archives of Internal Medicine, 163, 2213-2218. http://dx.doi.org/10.1001/archinte.163.18.2213
 McNeill, P.M., Kerridge, I.H., Henry, D.A., Stokes, B., Hill, S.R., Newby, D., Macdonald, G.J., Day, R.O., Maguire, J. and Henderson, K.M. (2006) Giving and Receiving of Gifts between Pharmaceutical Companies and Medical Specialists in Australia. Internal Medicine Journal, 36, 571-578.
 Alosaimi, F., Alkaabba, A., Qadi, M., Albahlal, A., Alabdulkarim, Y., Alabduljabbar, M. and Alqahtani, F. (2013) Acceptance of Pharmaceutical Gifts. Variability by Specialty and Job Rank in a Saudi Healthcare Setting. Saudi Medical Journal, 34, 854-860.
 McMurray, R.J., Clarke, O.W., Barrasso, J.A., Clohan, D.B., Epps Jr., C.H. and Glasson, J. (1991) Gifts to Physicians from Industry. JAMA, 265, 501. http://dx.doi.org/10.1001/jama.1991.03460040077034
 Brennan, T.A., Rothman, D.J., Blank, L., Blumenthal, D., Chimonas, S.C., Cohen, J.J., Goldman, J., Kassirer, J.P., Kimball, H., Naughton, J. and Smelser, N. (2006) Health Industry Practices That Create Conflicts of Interest: A Policy Proposal for Academic Medical Centers. JAMA, 295, 429-433. http://dx.doi.org/10.1001/jama.295.4.429
 Dana, J. and Loewenstein, G. (2003) A Social Science Perspective on Gifts to Physicians from Industry. JAMA, 290, 252-255.
 Korenstein, D., Keyhani, S. and Ross, J.S. (2010) Physician Attitudes toward Industry: A View across the Specialties. Archives of Surgery, 145, 570-577. http://dx.doi.org/10.1001/archsurg.2010.75
 Morgan, M.A., Dana, J., Loewenstein, G., Zinberg, S. and Schulkin, J. (2006) Interactions of Doctors with the Pharmaceutical Industry. Journal of Medical Ethics, 32, 559-563. http://dx.doi.org/10.1136/jme.2005.014480
 Wazana, A. (2000) Physicians and the Pharmaceutical Industry: Is a Gift Ever Just a Gift? JAMA, 283, 373-380.
 Rutledge, P., Crookes, D., McKinstry, B. and Maxwell, S.R. (2003) Do Doctors Rely on Pharmaceutical Industry Funding to Attend Conferences and Do They Perceive That This Creates a Bias in Their Drug Selection? Results from a Questionnaire Survey. Pharmacoepidemiology and Drug Safety, 12, 663-667.
 Blumenthal, D. (2004) Doctors and Drug Companies. The New England Journal of Medicine, 351, 1885-1890.
 Abbasi, K. and Smith, R. (2003) No More Free Lunches. BMJ, 326, 1155-1156.
 Norris, P., Herxheimer, A., Lexchin, J. and Mansfield, P. (2004) Drug Promotion: What We Know, What We Have Yet to Learn: Reviews of Materials in the WHO/HAI Database on Drug Promotion. WHO/EDM/PAR/2004.3.
 Watkins, C., Moore, L., Harvey, I., Carthy, P., Robinson, E. and Brawn, R. (2003) Characteristics of General Practitioners Who Frequently See Drug Industry Representatives: National Cross Sectional Study. BMJ, 326, 1178-1179.
 Steunman, M., Shilpak, M. and McPhee, S. (2001) Of Principles and Pens: Attitudes and Practices of Medicine House Staff toward Pharmaceutical Industry Promotions. The American Journal of Medicine, 110, 551-557.
 Sultana, S. and Khosru, K.H. (2011) Practice of Using Gifts as Promotional Materials for Marketing of Pharmaceutical Products in Bangladesh: A Survey Conducted on General Physicians and Representatives from Pharmaceutical Companies. Stamford Journal of Pharmaceutical Sciences, 4, 13-18.