Abaya, A. P., & Asuncion, T. B. (1985). Cost and returns of sweet potato in selected provinces: Philippines, 1983. Bureau of Agricultural Economics.
Lua i Stíl Chicago (17ú heag.)Abaya, Aurelia P., agus Tirso B. Asuncion. Cost and Returns of Sweet Potato in Selected Provinces: Philippines, 1983. Quezon City: Bureau of Agricultural Economics, 1985.
Lua MLA (9ú heag.)Abaya, Aurelia P., agus Tirso B. Asuncion. Cost and Returns of Sweet Potato in Selected Provinces: Philippines, 1983. Bureau of Agricultural Economics, 1985.
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