Cita APA (7th ed.)
Volpe, E. P. (1993). Biology and human concerns (4th ed.). Wm. C. Brown.
Cita Chicago (17th ed.)
Volpe, E. Peter. Biology and Human Concerns. 4th ed. Dubuque: Wm. C. Brown, 1993.
Cita MLA (9th ed.)
Volpe, E. Peter. Biology and Human Concerns. 4th ed. Wm. C. Brown, 1993.
Atenció: Aquestes cites poden no estar 100% correctes.