Gaya APA

Weaver, J, E., Clements, F, E. (1973). Plant Ecology (II). New York: Delhi Tata Mc Graw-Hill Publishing Company.

Gaya MLA

Weaver, John, E.., Clements, Frederic, E.. "Plant Ecology". II New York: Delhi Tata Mc Graw-Hill Publishing Company, 1973. Text.