APA
(1989). Colour aids gastroenterology and liver disease. London: charchill livingstone.
Chicago
1989. Colour aids gastroenterology and liver disease. London: charchill livingstone.
Harvard
(1989). Colour aids gastroenterology and liver disease. London: charchill livingstone.
MLA
Colour aids gastroenterology and liver disease. London: charchill livingstone. 1989.