APA

Welch C. E., . (1964). Polypoid lesions of the gastrointestinal tract. Philadelphia: W.B. Saunders Company.

Chicago

Welch Claude E, . 1964. Polypoid lesions of the gastrointestinal tract. Philadelphia: W.B. Saunders Company.

Harvard

Welch C. E., . (1964). Polypoid lesions of the gastrointestinal tract. Philadelphia: W.B. Saunders Company.

MLA

Welch Claude E, . Polypoid lesions of the gastrointestinal tract. Philadelphia: W.B. Saunders Company. 1964.