APA (7th ed.) Citation

Cotton, P. B., & Williams, C. B. (1982). Practical gastrointestinal endoscopy (2nd ed.). Blackwell Scientific Pub.

Chicago Style (17th ed.) Citation

Cotton, Peter B., and Christopher B. Williams. Practical Gastrointestinal Endoscopy. 2nd ed. Oxford: Blackwell Scientific Pub, 1982.

MLA (9th ed.) Citation

Cotton, Peter B., and Christopher B. Williams. Practical Gastrointestinal Endoscopy. 2nd ed. Blackwell Scientific Pub, 1982.