Gaya APA

Coombs, R, H., Howatt, W, A. (2005). The Addiction Counselor's Desk Reference . : John Wiley & Sons, Inc..

Gaya MLA

Coombs, Robert, Holman., Howatt, William, A.. "The Addiction Counselor's Desk Reference". : John Wiley & Sons, Inc., 2005. Text.