1. 1. RajeebLochan Dash, Mrs. A. RuhanBevi,” Real-time Transmission of Voice over 802.11 Wireless Networks Using Raspberry Pi” IJEDR 2014.
   2. Available [online]: http://http: // www. raspberrypi. org /downloads
   3. Available [online]: http://sourceforge.net/projects/win32diskimage
   4. Bhushan R Jichkar., "Proposed System for Placing Free Call over Wi-Fi Network Using VoIP and SIP", Int. Journal of Engineering Research and Applications, ISSN:2248-9622, Vol.4, Issue 1( Version 3), pp.132-135, January 2014.
   5. S.Sundar D.C.E, M. Krishna Kumar, M.Chinnadurai,“Voice Over Ip Via Bluetooth/Wi-Fi Peer To Peer”, IEEE Paper, March 30, 31, 2013.
   6. Matt Richardson, Shawn Wallace, "Getting Started with Raspberry”, Brian Jepson, O'Reilly Media Inc., United States of America, first edition, pp.10-31,December 2012
   7. Diptijavale, Bhartidixit ,Pankajjavale, “Performance Evaluation Of Wireless Transmission Using Embedded System”, IEEE Paper, November 26 , 2009.
   8. G.SaiPrasanna, S.Karunakar, “Implementation of VoIP Communication on Embedded Systems”, IJRCCT, Jan2013
   
   
2. 1. Amit Dhir and Chottu Ram, “Design of an Anaerobic Digester for waste water treatment,” IJARES ISSN: 2278-6252, vol. 1, No.5 pp. 56-66, November 2012.
   2. Robert H.Wayland and Timothy Oppelt, “Onsite Wastewater Treatment Systems Manual,”US Environmental Protection Agency, EPA/625/R-00/008, February.2008.
   3. Dr.M.A.Sivasankaran and Mr.R.Saravanane, “Recent Advances In Wastewater Treatment with Emphasis On Anaerobic and Membrane Technologies,” AICTEISTE, STTP, December 2002.
   4. B.C.Punmia, Ashok K Jain, Arun K Jain, “Water Supply Engineering,” Volume-II,Nov 2011