Bue, V. and Halim, A. 2009. Women at Work: A village study in Papua New Guinea – Tumua village in Markham Valley. Department of Agriculture, Papua New Guinea University of Technology, Lae.
Halim, A and Kaida, Y. 2001. Agricultural Extension in South East Asia – Historical Review.Centre for Farming.
Niugini Agrisaiens. Department of Agriculture, Papua New Guinea University of Technology,Lae.PNG.
Rogers, E. M. 1983. Diffusion of Innovations. Free Press. New York, USA.
Swanson, B. E. and Rajalahri, R. 2010.
Strengthening Agricultural Extension and Advisory Systems: Procedures for Assessing,Transforming and Evaluating Extension Systems.
The World Bank. 1818 H Street, Washington DC,USA.
System and Environmental Studies. Bangladesh Agricultural University, Mymensingh,Bangladesh.
Van. Den Ban, A.W. 2001. Agricultural Extension 2nd Edition. CBS Publishers & Distribution. PVT.LTD. New Delhi, India.