Gaya APA

Drossman, D, A. (2006). The Functional Gastrointestinal Disorder (Third Edition) (3). McLean, Virginia: Degnon Associates, Inc..

Gaya MLA

Drossman, Douglas, A.. "The Functional Gastrointestinal Disorder (Third Edition)". 3 McLean, Virginia: Degnon Associates, Inc., 2006. Text.