Gaya APA

Gifford, E, M., Foster, A, S. (1989). Morphology and evolution of vascular plants (3rd ed.). New York: W.H. Freeman and Co..

Gaya MLA

Gifford, Ernest, M.., Foster, Adrian, S.. "Morphology and evolution of vascular plants". 3rd ed. New York: W.H. Freeman and Co., 1989. Text.