Gaya APA
WHITEHEAD, G, ., WHITEHEAD, D, H.
(1989).
PITMAN BUSINESS CORRESPONDENCE
.
Jakarta:
Binarupa Aksara.
Gaya MLA
WHITEHEAD, Geoffrey, ., WHITEHEAD, David, H.
"PITMAN BUSINESS CORRESPONDENCE".
Jakarta:
Binarupa Aksara,
1989.
Text.