Gaya APA
English For Specific Purposes Economics. (1991).
Jakarta:
Gramedia Pustaka Utama.
Gaya Chicago
English For Specific Purposes Economics.
.
Jakarta:
Gramedia Pustaka Utama,
1991.
.
Gaya MLA
English For Specific Purposes Economics.
.
Jakarta:
Gramedia Pustaka Utama,
1991.
.
Gaya Turabian
English For Specific Purposes Economics.
Jakarta:
Gramedia Pustaka Utama,
1991.
.