Cita APA (7th ed.)

Allen, R. D. (1995). Biology: A critical thinking approach. McGraw-Hill.

Cita Chicago (17th ed.)

Allen, Robert D. Biology: A Critical Thinking Approach. Boston, Massachusetts: McGraw-Hill, 1995.

Cita MLA (9th ed.)

Allen, Robert D. Biology: A Critical Thinking Approach. McGraw-Hill, 1995.