Gaya APA
Forman, J. (1990).
The Random House Guide to Business Writing (Ed.8,; Cet.8).
Singapure:
McGraw-Hill Book Company.
Gaya MLA
Forman, Janis.
"The Random House Guide to Business Writing".
Ed.8,; Cet.8
Singapure:
McGraw-Hill Book Company,
1990.
Text.