Gaya APA
Poe, R, W., Supriyanto, T.
(2004).
Handbook of Business Letters
.
Jakarta:
penerbit PT Bhuana Ilmu Populer.
Gaya MLA
Poe, Roy, W.., Supriyanto, Tanto.
"Handbook of Business Letters".
Jakarta:
penerbit PT Bhuana Ilmu Populer,
2004.
Hibah.