Sinha, M N, and R K Rai. “Forage-Production Potential of Intensive Crop Rotation of Cowpea (Vigna Unguiculata) and Sorghum (Sorghum Bicolor) and Its Residual Effect on Oat (Avena Sativa)”. The Indian Journal of Agricultural Sciences, vol. 65, no. 9, June 2012, https://epubs.icar.org.in/index.php/IJAgS/article/view/19068.