Lawrence, G. H. M. (1951). Taxonomy of Vascular Plants. Macmillan.
Cita Chicago (17th ed.)Lawrence, George Hill Mathewson. Taxonomy of Vascular Plants. New York: Macmillan, 1951.
Cita MLA (9th ed.)Lawrence, George Hill Mathewson. Taxonomy of Vascular Plants. Macmillan, 1951.
Atenció: Aquestes cites poden no estar 100% correctes.