Gaya APA
ALLEN, J., LIENTZ, B, P. (1979).
EFFECTIVE BUSINESS COMMUNICATION: A PRACTICAL GUIDE .
California:
Goodyear.
Gaya MLA
ALLEN, Joseph., LIENTZ, BENNET, P..
"EFFECTIVE BUSINESS COMMUNICATION: A PRACTICAL GUIDE".
California:
Goodyear,
1979.
Textbook.