Yakubu, S., Atman, F. M., Usman, A. B., and Mohammed, R. “ECONOMICS OF FACTORS AFFECTING PRODUCTION AND RESOURCE - USE EFFICIENCY OF COWPEA IN NORTH – EASTERN STATES OF NIGERIA”. Journal of Agripreneurship and Sustainable Development 7, no. 1 (April 30, 2024): 74–82. Accessed December 12, 2024. https://njaat.com.ng/index.php/jasd/article/view/673.