Bigornia, M. L., & Abrera , J. (1983). Kain, kumain, kinain: Isang halimbawa ng "food chain" (2nd ed.). Children's Communication Center.
Lua i Stíl Chicago (17ú heag.)Bigornia, Mike L., agus Jess Abrera. Kain, Kumain, Kinain: Isang Halimbawa Ng "Food Chain". 2nd ed. Quezon City: Children's Communication Center, 1983.
Lua MLA (9ú heag.)Bigornia, Mike L., agus Jess Abrera. Kain, Kumain, Kinain: Isang Halimbawa Ng "Food Chain". 2nd ed. Children's Communication Center, 1983.
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