Cita APA (7th ed.)
Kirk, D. (1975). Biology Today (2a ed.). Random House.
Cita Chicago (17th ed.)
Kirk, David. Biology Today. 2a ed. New york: Random House, 1975.
Cita MLA (9th ed.)
Kirk, David. Biology Today. 2a ed. Random House, 1975.
Atenció: Aquestes cites poden no estar 100% correctes.