Gaya APA
Executive's Complete Portfolio of Business Letters. (2002).
[s.n]:
Pustaka Referensia Utama.
Gaya Chicago
Executive's Complete Portfolio of Business Letters.
Cet. 3.
[s.n]:
Pustaka Referensia Utama,
2002.
Text.
Gaya MLA
Executive's Complete Portfolio of Business Letters.
Cet. 3.
[s.n]:
Pustaka Referensia Utama,
2002.
Text.
Gaya Turabian
Executive's Complete Portfolio of Business Letters.
[s.n]:
Pustaka Referensia Utama,
2002.
Print.