Nelson, G. E. (1980). Biological principles with human perspectives. Wiley.
Cita Chicago (17th ed.)Nelson, Gideon E. Biological Principles with Human Perspectives. New York: Wiley, 1980.
Cita MLA (9th ed.)Nelson, Gideon E. Biological Principles with Human Perspectives. Wiley, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.