A. B. Aryal, S. Dhakal, A. Poudel, B. Aryal, and B. B. Adhikari, “Effect of different phosphorus levels and varieties on the productivity of cowpea (Vigna unguiculata L.) at Khairahani, Chitwan, Nepal”, J. Agric. Nat. Res., vol. 8, no. 1, pp. 103–112, Dec. 2025.