Gaya APA
Harvard, J., Rose, F. (1992).
Guide to professional & business correspondence ( Inggris-Indonesia} (Ed.rev. Cet. 3).
Jakarta:
Pustaka Binaman Pressindo.
Gaya MLA
Harvard, Joseph., Rose, Felix.
"Guide to professional & business correspondence ( Inggris-Indonesia}".
Ed.rev. Cet. 3
Jakarta:
Pustaka Binaman Pressindo,
1992.
Text.