Hasan, M., Akbar, M., Khandaker, Z. and Rahman, M. 2012. Effect of nitrogen fertilizer on yield contributing character, biomass yield and nutritive value of cowpea forage. Bangladesh Journal of Animal Science. 39, 1-2 (Feb. 2012), 83–88. DOI:https://doi.org/10.3329/bjas.v39i1-2.9680.