MLA

Pitchumoni, C. S, T. S Dharmarajan, and T Dharmarajan. Geriatric Gastroenterology. Dordrecht: Springer New York, 2012.

APA

Pitchumoni, C. S, Dharmarajan, T. S, & Dharmarajan, T. (2012). Geriatric Gastroenterology. Dordrecht: Springer New York.

Chicago

Pitchumoni, C. S., T. S Dharmarajan, and T Dharmarajan. Geriatric Gastroenterology. Dordrecht: Springer New York, 2012.