Sahay, Ratna, A K Singh, Archana Singh, R C Maurya, D K Tewari, and Sunil Singh. “Impact of Soil Health Card in Unnao District of Uttar Pradesh”. Indian Journal of Extension Education 55, no. 3 (December 10, 2020): 101–103. Accessed October 23, 2025. https://epubs.icar.org.in/index.php/IJEE/article/view/108288.