APA (7th ed.) Citation

Portis, S. A. (1944). Diseases of the digestive system (2nd ed.). Lea & Febiger.

Chicago Style (17th ed.) Citation

Portis, Sidney A. Diseases of the Digestive System. 2nd ed. Philadelphia: Lea & Febiger, 1944.

MLA (9th ed.) Citation

Portis, Sidney A. Diseases of the Digestive System. 2nd ed. Lea & Febiger, 1944.

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