APA
Benson L. D., . (1979). Plant classification. Lexington: Health.
Chicago
Benson Lyman David, . 1979. Plant classification. Lexington: Health.
Harvard
Benson L. D., . (1979). Plant classification. Lexington: Health.
MLA
Benson Lyman David, . Plant classification. Lexington: Health. 1979.