Cita APA (7th ed.)
Johnson, G. B. (2013). Essentials of the living world (4th ed.). McGraw-Hill.
Cita Chicago (17th ed.)
Johnson, George B. Essentials of the Living World. 4th ed. New York, NY: McGraw-Hill, 2013.
Cita MLA (9th ed.)
Johnson, George B. Essentials of the Living World. 4th ed. McGraw-Hill, 2013.
Atenció: Aquestes cites poden no estar 100% correctes.