Gaya APA
Guffey, M, E. et al (2006).
Business communication process & product : edisi 4 (Cet. 2.).
Jakarta:
Salemba Empat.
Gaya MLA
Guffey, Mary, Ellen. et al.
"Business communication process & product : edisi 4".
Cet. 2.
Jakarta:
Salemba Empat,
2006.
Text.