APA Style
Bockus, H, L., Berk, J, E. (1985).
Bockus Gastroenterology. Vol. 1 (4th ed).
Philadelphia:
W.B Saunder Company.
MLA Style
Bockus, Henry, L., Berk, J., Edward.
"Bockus Gastroenterology. Vol. 1".
4th ed
Philadelphia:
W.B Saunder Company,
1985.
print.