Cita APA (7th ed.)
Avila, V. L. (1992). Biology: A human endeavor. Bookmark.
Cita Chicago (17th ed.)
Avila, Vernon L. Biology: A Human Endeavor. California: Bookmark, 1992.
Cita MLA (9th ed.)
Avila, Vernon L. Biology: A Human Endeavor. Bookmark, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.