Gaya APA

Gibbs, N., Duffy, M. (2012). The Presidents Club: Inside the World's Most Exclusive Fraternity . New York: Simon and Schuster Paperbacks.

Gaya MLA

Gibbs, Nancy., Duffy, Michael. "The Presidents Club: Inside the World's Most Exclusive Fraternity". New York: Simon and Schuster Paperbacks, 2012. Buku.