APA

Truelove S., Willoughby C., . (1979). Topics in gastroenterology. Londres: Blackwwell Scientific Publications.

Chicago

Truelove S.C, Willoughby C.P, . 1979. Topics in gastroenterology. Londres: Blackwwell Scientific Publications.

Harvard

Truelove S., Willoughby C., . (1979). Topics in gastroenterology. Londres: Blackwwell Scientific Publications.

MLA

Truelove S.C, Willoughby C.P, . Topics in gastroenterology. Londres: Blackwwell Scientific Publications. 1979.