Sallam DMN. The Importance of marketing information in enhancing the effectiveness of the extension service (the experience of the potato seed multiplication Center in the optimal use of marketing information). tu.edu.ye.journals [Internet]. 2023 Jan. 23 [cited 2024 Nov. 21];6(11):59-76. Available from: https://journal.tu.edu.ye/index.php/edu/article/view/1157