Não informado. (1984). Year book of digestive diseases. Year Book Medical Publishers.
Chicago-referens (17:e uppl.)Não informado. Year Book of Digestive Diseases. Chicago, Ill: Year Book Medical Publishers, 1984.
MLA-referens (8:e uppl.)Não informado. Year Book of Digestive Diseases. Year Book Medical Publishers, 1984.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.