Nomau, Amadu. “Evaluation of the Effect of Price Variations of Inorganic Fertilizer on Farmer’s Productivity in Giwa L. G. A of Kaduna State Nigeria”. Zaria Journal of Educational Studies (ZAJES) 18, no. 1 (May 31, 2018): 49–56. Accessed December 21, 2024. https://zarjes.com/ZAJES/article/view/261.