Gaya APA

al., E, H, G, E. (1990). Gastrointestinal pathology; united states and canadion acamedy of pathology, inc. . Baltimore: Williams and Wilkins.

Gaya MLA

al., Editor:, Harvey, Goldman,, Et.. "Gastrointestinal pathology; united states and canadion acamedy of pathology, inc.". Baltimore: Williams and Wilkins, 1990. Text.