Cita APA (7th ed.)
Roberts, M. (1986). Biology: A functional approach (4th ed.). Thomas Nelson.
Cita Chicago (17th ed.)
Roberts, M.B.V. Biology: A Functional Approach. 4th ed. Walton: Thomas Nelson, 1986.
Cita MLA (9th ed.)
Roberts, M.B.V. Biology: A Functional Approach. 4th ed. Thomas Nelson, 1986.
Atenció: Aquestes cites poden no estar 100% correctes.