Gaya APA
COTTON, P, B., WILLIAMS, C, B. (1990).
Practical gastrointestinal endoscopy (3rd ed.).
Oxford:
Blackwell Scientific.
Gaya MLA
COTTON, Peter, B.., WILLIAMS, Chistopher, B..
"Practical gastrointestinal endoscopy".
3rd ed.
Oxford:
Blackwell Scientific,
1990.
Buku.