Bigornia, M. L., & Abrera , J. (1983). Kain, kumain, kinain: Isang halimbawa ng "food chain" (2nd ed.). Children's Communication Center.
Cita Chicago Style (17a ed.)Bigornia, Mike L., y Jess Abrera. Kain, Kumain, Kinain: Isang Halimbawa Ng "Food Chain". 2nd ed. Quezon City: Children's Communication Center, 1983.
Cita MLA (9a ed.)Bigornia, Mike L., y Jess Abrera. Kain, Kumain, Kinain: Isang Halimbawa Ng "Food Chain". 2nd ed. Children's Communication Center, 1983.
Precaución: Estas citas no son 100% exactas.