APA (7th ed.) Citation

Cotton, P. B., & Williams, C. B. (1996). Practical gastrointestinal endoscopy (4. ed.). Blackwell.

Chicago Style (17th ed.) Citation

Cotton, Peter B., and Christopher B. Williams. Practical Gastrointestinal Endoscopy. 4. ed. Oxford [u.a.]: Blackwell, 1996.

MLA (9th ed.) Citation

Cotton, Peter B., and Christopher B. Williams. Practical Gastrointestinal Endoscopy. 4. ed. Blackwell, 1996.