Gaya APA
Bockus, H, L., Berk, J, E. (1985).
Bockus Gastroenterology. Vol. 2 (4th ed).
Philadelphia:
W.B Saunders Company.
Gaya MLA
Bockus, Henry, L., Berk, J, Edward.
"Bockus Gastroenterology. Vol. 2".
4th ed
Philadelphia:
W.B Saunders Company,
1985.
print.