APA Style

Humphrey, Paul. (1997). Daur Ulang . New York :: Quality Press.

Chicago Style

Humphrey, Paul. Daur Ulang. New York :: Quality Press, 1997. Text.

MLA Style

Humphrey, Paul. Daur Ulang. New York :: Quality Press, 1997. Text.

Turabian Style

Humphrey, Paul. Daur Ulang. New York :: Quality Press, 1997. Print.