Gaya APA
Hasibuan, Sofia Rangkuti. (1990).
English for specific purposes agriculture/ Sofia Rangkuti Hasibuan .
Jakarta:
Gramedia Pustaka Utama.
Gaya Chicago
Hasibuan, Sofia Rangkuti.
English for specific purposes agriculture/ Sofia Rangkuti Hasibuan.
Jakarta:
Gramedia Pustaka Utama,
1990.
Text.
Gaya MLA
Hasibuan, Sofia Rangkuti.
English for specific purposes agriculture/ Sofia Rangkuti Hasibuan.
Jakarta:
Gramedia Pustaka Utama,
1990.
Text.
Gaya Turabian
Hasibuan, Sofia Rangkuti.
English for specific purposes agriculture/ Sofia Rangkuti Hasibuan.
Jakarta:
Gramedia Pustaka Utama,
1990.
Print.