APA
Butcher G. P., . (2003). Gastroenterology : an illustrated colour text. New York: Churchill Livingstone.
Chicago
Butcher Graham P, . 2003. Gastroenterology : an illustrated colour text. New York: Churchill Livingstone.
Harvard
Butcher G. P., . (2003). Gastroenterology : an illustrated colour text. New York: Churchill Livingstone.
MLA
Butcher Graham P, . Gastroenterology : an illustrated colour text. New York: Churchill Livingstone. 2003.