Gaya APA

Swanson, C, P., Odum, E, P. (1971). Fundamentals of ecology . Philadelphia: Philadelphia: W.B. Sounders Company; 1971.

Gaya MLA

Swanson, Carl, P.., Odum, Eugene, P.. "Fundamentals of ecology". Philadelphia: Philadelphia: W.B. Sounders Company; 1971, 1971. Text.