Ghimire, S, A Nainabasti, MD Sharma, S Marahatta, and HN Giri. “Effects of Urea and Poultry Manure Combination on Yield and Quality of Different Lettuce (lactucasativa L.) Varieties in Chitwan, Nepal”. SAARC Journal of Agriculture 17, no. 1 (August 25, 2019): 201-210. Accessed June 6, 2020. https://www.banglajol.info/index.php/SJA/article/view/42773.