Gaya APA

Leland, R, C., E., K, R. (1974). The Ecosphere Organism,Habitats and Distubances . USA: Harper & Row.

Gaya MLA

Leland, Rodgers, C.., E., Kerstotter, Rex. "The Ecosphere Organism,Habitats and Distubances". USA: Harper & Row, 1974. Text.