Gaya APA
HOBBS, J.
(1980).
Longman english course : books 2A/ J. Hobbs
.
Yogyakarta:
Kanisius.
Gaya MLA
HOBBS, J..
"Longman english course : books 2A/ J. Hobbs".
Yogyakarta:
Kanisius,
1980.
Text.