APA (7th ed.) Citation

(1977). The gastrointestinal tract. Williams & Wilkins.

Chicago Style (17th ed.) Citation

The Gastrointestinal Tract. Baltimore: Williams & Wilkins, 1977.

MLA (9th ed.) Citation

The Gastrointestinal Tract. Williams & Wilkins, 1977.

Warning: These citations may not always be 100% accurate.