Cita APA (7th ed.)

Keeton, W. T., & Bensadoun, P. D. (1969). Elements of biological science (First edition.). National Bookstore.

Cita Chicago (17th ed.)

Keeton, William T., i Paula DiSanto Bensadoun. Elements of Biological Science. First edition. Manila: National Bookstore, 1969.

Cita MLA (9th ed.)

Keeton, William T., i Paula DiSanto Bensadoun. Elements of Biological Science. First edition. National Bookstore, 1969.