Gaya APA
Rahardi, K., Suwandari, A, R. (2007).
Business & Secretarial English Gambit's (Cet. 1).
Yogyakarta:
Pinus Book Publisher.
Gaya MLA
Rahardi, Kunjana., Suwandari, Agustina, Reni.
"Business & Secretarial English Gambit's".
Cet. 1
Yogyakarta:
Pinus Book Publisher,
2007.
Text.