Gaya APA
First Things First : Students' Book. (1975).
Yogyakarta:
Yayasan Kanisius.
Gaya Chicago
First Things First : Students' Book.
1st Ed.
Yogyakarta:
Yayasan Kanisius,
1975.
Text.
Gaya MLA
First Things First : Students' Book.
1st Ed.
Yogyakarta:
Yayasan Kanisius,
1975.
Text.
Gaya Turabian
First Things First : Students' Book.
Yogyakarta:
Yayasan Kanisius,
1975.
Print.