Gaya APA
ENONG, D, S, ., D, A. (1986).
PRACTICAL GUIDE TO BUSINESS CORESPONDENCE (3).
JAKARTA:
CV SIMPLEX ANGGOTA IKAPI.
Gaya MLA
ENONG, DRS.DIALINUS, SJAH, ., DRA, AZIMAR.
"PRACTICAL GUIDE TO BUSINESS CORESPONDENCE".
3
JAKARTA:
CV SIMPLEX ANGGOTA IKAPI,
1986.
Printed Book.