Study Obstacles and Problems of Agriculture Extension Traning Courses from Extension Workers Points of View : A Case Study of Dezful, Iran. Journal of Educational and Social Research, London, U.K., v. 2, n. 2, p. 431, 2012. Disponível em: https://www.richtmann.org/journal/index.php/jesr/article/view/11855.. Acesso em: 19 may. 2024.