Gaya APA
Dugger, J.
(2002).
Business Letters for busy people
(
Ed.1)
.
Kuala lumpur:
Wisma ILBS.
Gaya MLA
Dugger, Jim.
"Business Letters for busy people".
Ed.1
Kuala lumpur:
Wisma ILBS,
2002.
Sekretari D3.