APA

Truelove S., Heyworth M., . (1978). Topics in gastroenterology. Londres: Blackwwell Scientific Publications.

Chicago

Truelove S.C, Heyworth M.F, . 1978. Topics in gastroenterology. Londres: Blackwwell Scientific Publications.

Harvard

Truelove S., Heyworth M., . (1978). Topics in gastroenterology. Londres: Blackwwell Scientific Publications.

MLA

Truelove S.C, Heyworth M.F, . Topics in gastroenterology. Londres: Blackwwell Scientific Publications. 1978.