APA

Clarkston W. K., Presti M. E., Petersen P. F., Zachary P. E., Fan W. X., Leonardi C. L., Vernava A. M., Longo W. E. & Kreeger J. M. (19980506). Role of Mycobacterium paratuberculosis in Crohn's disease: a prospective, controlled study using polymerase chain reaction. : Diseases of the colon and rectum.

Chicago

Clarkston W K, Presti M E, Petersen P F, Zachary P E, Fan W X, Leonardi C L, Vernava A M, Longo W E and Kreeger J M. 19980506. Role of Mycobacterium paratuberculosis in Crohn's disease: a prospective, controlled study using polymerase chain reaction. : Diseases of the colon and rectum.

Harvard

Clarkston W. K., Presti M. E., Petersen P. F., Zachary P. E., Fan W. X., Leonardi C. L., Vernava A. M., Longo W. E. and Kreeger J. M. (19980506). Role of Mycobacterium paratuberculosis in Crohn's disease: a prospective, controlled study using polymerase chain reaction. : Diseases of the colon and rectum.

MLA

Clarkston W K, Presti M E, Petersen P F, Zachary P E, Fan W X, Leonardi C L, Vernava A M, Longo W E and Kreeger J M. Role of Mycobacterium paratuberculosis in Crohn's disease: a prospective, controlled study using polymerase chain reaction. : Diseases of the colon and rectum. 19980506.