Cita APA (7th ed.)
ebrary, Inc. (1989). Opportunities in biology. National Academy Press.
Cita Chicago (17th ed.)
ebrary, Inc. Opportunities in Biology. Washington: National Academy Press, 1989.
Cita MLA (9th ed.)
ebrary, Inc. Opportunities in Biology. National Academy Press, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.