Nurse Call/Communication Systems (2013) D5034.MD The University of Texas, Anderson Cancer Center, ODG 121312, 1-9. http://www2.mdanderson.org/depts/cpm/standards/Guides/D5034-M.pdf
 Chaboyera, W., Thalibb, L., Alcornc, K. and Fosterd, M. (2007) The effect of an ICU liaison nurse on patients and family’s anxiety prior to transfer to the ward: An intervention study. Intensive and Critical Care Nursing, 23, 362-369. doi:10.1016/j.iccn.2007.04.005
 Pour Ramezani, F. (2002) Survey of nursing care of patients how connected to Mechanical ventilator in critical care unit in Rasht educational hospital. Gilan Journal of Nursing, Gilan Medical University, 38, 22.
 Khalaila, R., Zbidat, W., Anwar, K., Bayya, A., Linton, D.M. and Sviri, S. (2011) Communication difficulties and psychoemotional distress in patients receiving mechanical ventilation. American Journal of Critical Care, 20, 470-479. doi:10.4037/ajcc2011989
 Kuruzovich, J. (2008) Wireless communication role in patient response time: A study of vocera integration with a nurse calls system. Computers, Informatics, Nursing, 26, 159-166. doi:10.1097/01.NCN.0000304780.27070.ee
 Wireless Nurse Call System. http://www.easylinkuk.co.uk/page58.html