Gaya APA
HARVARD, J. et al (1994).
Guide to professional and business correspondence (Inggris - Indonesia) .
Jakarta:
Pustaka Binaman Pressindo.
Gaya MLA
HARVARD, Joseph. et al.
"Guide to professional and business correspondence (Inggris - Indonesia)".
Jakarta:
Pustaka Binaman Pressindo,
1994.
Text.