APA (7th ed.) Citation

Davis, P. H., & Heywood, V. H. (1963). Principles of angiosperm taxonomy. Van Nostrand.

Chicago Style (17th ed.) Citation

Davis, P. H., and V. H. Heywood. Principles of Angiosperm Taxonomy. Princeton, N.J.: Van Nostrand, 1963.

MLA (9th ed.) Citation

Davis, P. H., and V. H. Heywood. Principles of Angiosperm Taxonomy. Van Nostrand, 1963.