Mader, S. (1998). Biology (6th ed.). McGraw-Hill.
Cita Chicago (17th ed.)Mader, Sylvia. Biology. 6th ed. Boston: McGraw-Hill, 1998.
Cita MLA (9th ed.)Mader, Sylvia. Biology. 6th ed. McGraw-Hill, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.