Muller, W. H. (1979). Botany: A functional approach (4th ed.). Macmillan.
Cita Chicago (17th ed.)Muller, Walter H. Botany: A Functional Approach. 4th ed. New York: Macmillan, 1979.
Cita MLA (9th ed.)Muller, Walter H. Botany: A Functional Approach. 4th ed. Macmillan, 1979.
Atenció: Aquestes cites poden no estar 100% correctes.