Gaya APA
Executive's complete portofolio of business letters. (1995).
Malang:
Pustaka Referensia Utama.
Gaya Chicago
Executive's complete portofolio of business letters.
.
Malang:
Pustaka Referensia Utama,
1995.
Text.
Gaya MLA
Executive's complete portofolio of business letters.
.
Malang:
Pustaka Referensia Utama,
1995.
Text.
Gaya Turabian
Executive's complete portofolio of business letters.
Malang:
Pustaka Referensia Utama,
1995.
Print.