Cotton, Peter B., <br/><br/>
Practical gastrointestinal endoscopy / 
by Peter B. Cotton and Christopher B. Williams ; foreword by Marvin N. Sleisenger. 
 - Third edition. 
 - Oxford :  Blackwell Scientific Publications,  1990. 
 - 289 pages. : illustrations. ; 24 cm. 
<br/><br/><label>ISBN: </label>0632027061 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Digestive organs--Diseases--Diagnosis.<br/>Endoscope and endoscopy.<br/>Gastrointestinal diseases--Diagnosis.<br/>Endroscopy.<br/>Gastroscopy.