Gaya APA
HOBBS, J.
(1981).
Longman english course : book 2B/ J. Hobbs
.
Yogyakarta:
Kanisius.
Gaya MLA
HOBBS, J..
"Longman english course : book 2B/ J. Hobbs".
Yogyakarta:
Kanisius,
1981.
Text.