APA

I. Friedman S. L., .Current diagnosis & treatment in gastroenterology. New York: Lange Medical Books.

Chicago

I. Friedman Scott L, .Current diagnosis & treatment in gastroenterology. New York: Lange Medical Books.

Harvard

I. Friedman S. L., .Current diagnosis & treatment in gastroenterology. New York: Lange Medical Books.

MLA

I. Friedman Scott L, .New York: Lange Medical Books. .