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