Briones, R. d. l. C. (1977). Growth and yield performance of sweet potato varieties differing in morphological characteristics [microform]. Photoduplication Service. University of the Philippines Library.
Chicago-referens (17:e uppl.)Briones, Ricardo de la Cruz. Growth and Yield Performance of Sweet Potato Varieties Differing in Morphological Characteristics [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1977.
MLA-referens (9:e uppl.)Briones, Ricardo de la Cruz. Growth and Yield Performance of Sweet Potato Varieties Differing in Morphological Characteristics [microform]. Photoduplication Service. University of the Philippines Library, 1977.
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