Cita APA (7a ed.)

Tytgat, G. N., & Tytgat, S. H. (2009). Grading and staging in gastroenterology. Thieme.

Cita Chicago Style (17a ed.)

Tytgat, Guido N.J, y Stefaan H.A.J Tytgat. Grading and Staging in Gastroenterology. Stutgart ; New York: Thieme, 2009.

Cita MLA (9a ed.)

Tytgat, Guido N.J, y Stefaan H.A.J Tytgat. Grading and Staging in Gastroenterology. Thieme, 2009.