Gaya APA

Waldron, I., E, E, R, R. (1973). Environment and Population Problem and Solutions . New York: Holt Rinehart & Winston..

Gaya MLA

Waldron, Ingrid., E, E., RIcklefs,, Robert. "Environment and Population Problem and Solutions". New York: Holt Rinehart & Winston., 1973. Text.