APA Style
Guffey, Mary Ellen. (2010).
Essentials of Business Communication (2nd).
Singapore:
Cengage Learning.
Chicago Style
Guffey, Mary Ellen.
Essentials of Business Communication.
2nd
Singapore:
Cengage Learning,
2010.
.
MLA Style
Guffey, Mary Ellen.
Essentials of Business Communication.
2nd
Singapore:
Cengage Learning,
2010.
.
Turabian Style
Guffey, Mary Ellen.
Essentials of Business Communication.
2nd
Singapore:
Cengage Learning,
2010.
.