De la Paz, R., Amparado, E., De Jesus, J., & Gonzales, J. (1998). Essentials of biology. ACLC Trading Enterprises.
Lua i Stíl Chicago (17ú heag.)De la Paz, R.M, E.A Amparado, J.B De Jesus, agus Jomari Gonzales. Essentials of Biology. Quezon City: ACLC Trading Enterprises, 1998.
Lua MLA (9ú heag.)De la Paz, R.M, et al. Essentials of Biology. ACLC Trading Enterprises, 1998.
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