DIFFERENTIALS IN PROFITABILITY AND EFFICIENCY OF COWPEA MARKETING IN RURAL, SEMI- URBAN AND URBAN MARKETS IN NASARAWA STATE, NIGERIA . aijas [Internet]. 2023 Jul. 15 [cited 2026 Feb. 1];7(1):20-31. Available from: https://acseusa.bdtopten.com/index.php/aijas/article/view/287