L. P. E. Yo-Essien, “Oil Spill Management in Nigeria: Challenges of Pipeline Vandalism in the Niger Delta Region of Nigeria,” National Oil Spill Detection and Response Agency (NOSDRA) Abuja, 2008. http://ipec.utulsa.edu/Conf2008/Manuscripts%20&%20presentations%20received/Eyo_Essien_2.pdf
 E. Ugwuani, “Shell Records 2580 Barrel Oil Spill,” The Nations, 7 June 2011. http://www.thenationonlineng.net/2011/index.php/business/energy/8578-shell-records-2-580-barrels-oil-spill.html
 M. Sunmonu, “SPDC Response on Amnesty International Publication on Spills in the Niger Delta,” 2010. http://www.shell.com/home/content/environment_society/society/nigeria/spills/
 K. N. Aroh, I. U. Ubong, C. L. Eze, I. M. Harry, J. C. Umo-Otong and A. E. Gobo, “Oil Spill Incidents and Pipeline Vandalization in Nigeria: Impact on Public Health and Negation to Attainment of Millennium Development Goal: The Ishiagu Example,” Disaster Prevention and Management, Vol. 19, No. 1, 2010, pp. 70-87. Emerald Group Publishing Limited. http://www.emeraldinsight.com/journals.htm?issn=0965-3562&volume=19&issue=1
 P. O. Olajide, S. O. Ajisebutu, S. B. Williams and L. B. Ogbeifun, “Fish Kills and Physiochemical Qualities of Crude Oil Polluted River in Nigeria,” Research Journal of Fisheries and Hydrobiology, Vol. 4, No. 3, 2009, pp. 55-64. http://wenku.baidu.com/view/edd2ed7001f69e31433294d3.html
 Amnesty International, “Nigeria: Petroleum, Pollution and Poverty in the Niger Delta,” Index: AFR 44/017/2009, 2009. http://www.amnesty.org/en/library/asset/AFR44/017/2009/en/e2415061-da5c-44f8-a73c-a7a4766ee21d/afr440172009en.pdf
 S. Chastian, “Pipeline Right of Way Encroachment: Exploring Emerging Technologies That Address the Problem,” Documents and Resource for Small Business and Professionals, 2009. http://www.docstoc.com/Docs/Document-Detail-Google.aspx?doc_id=64075370
 Press Release, “Magal Receives R&D Contract to Enhance Its Pipeguard Technology for Protection of Gas Pipelines,” Research Sponsored by a Large US Gas Utility, 2011. http://www.gsnmagazine.com/article/22740/magal_receives_r_d_contract_enhance_its_pipeguard_
 Free Patents Online, “All Inventions of Mankind”, Available at: http://www.google.no/imgres?imgurl=http://www.freepatesonline.com/7203322-0-large.jpg&imgrefurl=http://www.freepatensonline.com/7203322.html&h=1330&w=1731&sz=206&tbnid=NvvYHFhsysJ9SM:&tbnh=115&tbnw=150&prev=/search%3Fq%3Dacoustic%2Bdetector%26tbm%3Disch%26tbo%3Du&zoom=1&q=acoustic+detector&hl=no&usg=__1tcAnpIJqCMAWZIPYg-q5QlFrco=&sa=X&ei=tyMbTuyGF43Jsgb1oN3EDw&ved=0CEYQ9QEwBg
 The Website for the Offshore Oil and Gas Industry, “Pipeline Inspection and Maintenance,” 2011. http://www.offshore-technology.com/contractors/pipeline_inspec/
 J. A. Agbakwuru, O. T. Gudmestad, J. Groenli and H. Skjaveland, “Development of Method/Apparatus for Close-Visual Inspection of under-Water Structures (Especially Pipelines) in Muddy and Unclear Water Condition,” Proceedings of the 30th International Conference on Ocean, Offshore and Arctic Engineering, OMAE, Rotterdam, 19-24 June 2011.
 GE Oil and Gas, “PII Pipeline Solution ThreatScan: Real Time Monitoring for Threats and Impacts on Pipelines”, 2010. http://site.ge-energy.com/businesses/ge_oilandgas/en/prod_serv/serv/pipeline/en/downloads/threatScan_us.pdf.
 US Department of Energy, Office of Fossil Energy, “De- tection of Unauthorized Construction Equipment in Pipeline Right-of-Way, 2011. http://www.fossil.energy.gov/fred/factsheet.jsp?doc=2564&projtitle=Detection%20of%20Unauthorized%20Construction%20Equipment%20in%20Pipeline%20Right-of-Ways
 G. L. Burkhardt and A. E. Crouch, “Realtime Monitoring of Pipelines from Third-Party Contact,” Semi-Annual Technical Progress Report No.4, Cooperative Agreement DE-FC26-03NT41878, Southwest Research Institute? Project 14.10211, 2005. http://www.osti.gov/bridge/servlets/purl/859333-KJOMJB/859333.pdf
 J. M. Muggleton and M. J. Brennan, “Leak Noise Propagation and Attenuation in Submerged Plastic Water Pipes,” Journal of Sound and Vibration, Vol. 278, No. 3, 2004, pp. 527-537. doi:10.1016/j.jsv.2003.10.052
 D. K. Olofin, Gulf Oil Co., Western Geophysical Co. and R. A. Will, “Acquisition and Processing of Shallow Water 3-D Seismic Surveys over Producing Fields in the Northwest Niger Delta Offshore,” Technology Conference, Houston, 6-7 November 1989.
 S. Adebayo, “HDD Technology Takes Pipeline Across 1.7 km Escravos River,” Fortune Business, 2010. http://www.nigerianbestforum.com/generaltopics/?p=60628