Laetsch, W. M. (1979). Plants: Basic concepts in botany. Allyn and Bacon.
Cita Chicago (17th ed.)Laetsch, W. M. Plants: Basic Concepts in Botany. Boston: Allyn and Bacon, 1979.
Cita MLA (9th ed.)Laetsch, W. M. Plants: Basic Concepts in Botany. Allyn and Bacon, 1979.
Atenció: Aquestes cites poden no estar 100% correctes.