SHARMA, G L, et al. “Role of Summer Legumes on Productivity of Maize (Zea Mays)- Wheat (Triticum aestivum)cropping System on Sandy-Loam Soil of Western Uttar Pradesh”. The Indian Journal of Agricultural Sciences, vol. 68, no. 6, Feb. 2013, https://epubs.icar.org.in/index.php/IJAgS/article/view/27568.