1.Aulakh, K.S. 2005a. Crop Diversification is necessity: Paddy a drain on Punjab water resources. The Tribune(Chandigarh), Feb. 25.

2.Aulakh, K.S. 2005b. Punjab Agricultural University accomplishments and challenges. PAU Publication, pp. 23

3.Chauhan, S.K. and Mangat, P.S. 2006. Poplar based agroforestry is ideal for Punjab, India. Asia-Pacific Agro-forestry News, 28: 7-8.

4.Chauhan, S.K., Saini, K.S., Saralch, H.S., Rani, S. and Verma, A. 2015. Wheat and barley crop performance under different sowing methods under poplar based agro-forestry system. Indian Journal of Ecology, 42(2): 528-530

5.Fazli, S. 1990. Financial analysis of the selected shelter systems in Pakistan. Pakistan Journal of Forestry, 40: 247-252.

6.Johl, S.S. 2005. Dithering on diversification: Farm sector in Punjab under squeeze. The Tribune(Chandigarh), February

7.Khan, M.M. and Betters, D.R. 1990. Economic analysis of agro-forestry options for small irrigated farms in Punjab province, Pakistan. Pakistan Journal of Forest, 40: 206-209.

8.Kareemulla, K., Rizvi, R.H., Kumar, K., Dwivedi, R.P. and Singh, R. 2005. Poplar agro-forestry systems of western Uttar Pradesh in Northern India: A socio-economic analysis. Forests, Trees and Livelihood, 15(4): 375-381.

9.Kumar, A. 2005. An economic analysis of production and marketing of poplar in Punjab. M.Sc. Thesis, Punjab Agricultural University, Ludhiana

10.Sidhu, P.S. 1998. Farmers and farming in Punjab. Proc. Brain Storming Meeting. Oct. 23-24, PAU, Ludhiana, pp. 36.

11.Shah, P. 1988. Potential of agro-forestry as land use technology for rural poor. Advances in Forest Research in India, 1: 27-100.

12.Singh, S. 1999. An economic analysis of poplar production and processing in Punjab state. M.Sc. Thesis, submitted to Punjab Agricultural University, Ludhiana.

13.Saxena, N.C. 2000. Farm and agro-forestry in India-Policy and legal issues. Planning Commission. Government of India, 50

14.Singh, J.P. and Sharma, V.P. 2000. Productivity and diversification in Haryana agriculture. Productivity, 40(4): 644-652.

15.World Bank (2002). A revised forest strategy for the World Bank group. World Bank, Washington, DC