Tran Thi, Dien. “IMPROVING THE ECONOMIC EFFICIENCY OF GRAPEFRUIT FARMS IN PHUC NINH COMMUNE - YEN SON DISTRICT - TUYEN QUANG PROVINCE”. SCIENTIFIC JOURNAL OF TAN TRAO UNIVERSITY 7, no. 24 (April 12, 2022). Accessed May 18, 2024. http://tckh.daihoctantrao.edu.vn/index.php/sjttu/article/view/684.