Cita APA (7th ed.)

Levetin, E., & McMahon, K. (2011). Plants & society (6th ed.). McGraw-Hill.

Cita Chicago (17th ed.)

Levetin, Estelle, i Karen McMahon. Plants & Society. 6th ed. New York: McGraw-Hill, 2011.

Cita MLA (8th ed.)

Levetin, Estelle, i Karen McMahon. Plants & Society. 6th ed. McGraw-Hill, 2011.