APA

Lawrence G. H. M., . (1971). Taxonomy of vascular plants. New York: Macmillan.

Chicago

Lawrence George H M, . 1971. Taxonomy of vascular plants. New York: Macmillan.

Harvard

Lawrence G. H. M., . (1971). Taxonomy of vascular plants. New York: Macmillan.

MLA

Lawrence George H M, . Taxonomy of vascular plants. New York: Macmillan. 1971.