Cita APA (7th ed.)

Gracio, J. B. (2009). Aves. University of the Philippines Press.

Cita Chicago (17th ed.)

Gracio, Jerry B. Aves. Quezon City: University of the Philippines Press, 2009.

Cita MLA (9th ed.)

Gracio, Jerry B. Aves. University of the Philippines Press, 2009.