Gaya APA
Suyarto, ., S, H, R.
(1994).
English Business Corespondence
(
2)
.
Bandung:
Humaniora Utama Press.
Gaya MLA
Suyarto, ., S, Hetty, Rachdiana.
"English Business Corespondence".
2
Bandung:
Humaniora Utama Press,
1994.
Buku.