Pascual, Nerelito P., and Magdalena S. Laguna. “COST AND RETURN ANALYSIS OF VARIOUS SWEET POTATO VARIETIES CULTIVARS”. Annals of Tropical Research 11, no. 1-4 (October 28, 1989): 55–62. Accessed December 5, 2025. https://atr.vsu.edu.ph/article/view/631.