Raven, P. H. (1981). Biology of plants (3ª ed.). Worth Publishers.
Cita Chicago (17th ed.)Raven, Peter H. Biology of Plants. 3ª ed. Worth Publishers, 1981.
Cita MLA (9th ed.)Raven, Peter H. Biology of Plants. 3ª ed. Worth Publishers, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.