Pancho, J. V., & Obien, S. R. (1995). Manual of ricefield weeds in the Philippines. Philippine Rice Research Institute.
Lua i Stíl Chicago (17ú heag.)Pancho, Juan Valles, agus S. R. Obien. Manual of Ricefield Weeds in the Philippines. Munoz, Nueva Ecija: Philippine Rice Research Institute, 1995.
Lua MLA (9ú heag.)Pancho, Juan Valles, agus S. R. Obien. Manual of Ricefield Weeds in the Philippines. Philippine Rice Research Institute, 1995.
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