Cita APA

Davis, P. H., & Heywood, V. H. (1973). Principles of angiosperm taxonomy. Huntington.

Citación estilo Chicago

Davis, P. H., y V. H. Heywood. Principles of Angiosperm Taxonomy. New York: Huntington, 1973.

Cita MLA

Davis, P. H., y V. H. Heywood. Principles of Angiosperm Taxonomy. Huntington, 1973.