APA

Porter C. L., . (1980). Taxonomy of flowering plants. San Francisco: W.H. Freeman and Company.

Chicago

Porter C L, . 1980. Taxonomy of flowering plants. San Francisco: W.H. Freeman and Company.

Harvard

Porter C. L., . (1980). Taxonomy of flowering plants. San Francisco: W.H. Freeman and Company.

MLA

Porter C L, . Taxonomy of flowering plants. San Francisco: W.H. Freeman and Company. 1980.