Gaya APA

Niven, D. (2001). The 100 Simple Secrets Of Happy People : what scientists have learned and how you can use it (Trawas) . New York: HarperCollins Publishers, Inc..

Gaya MLA

Niven, David. "The 100 Simple Secrets Of Happy People : what scientists have learned and how you can use it (Trawas)". New York: HarperCollins Publishers, Inc., 2001. Text.