Gaya APA
ROSS, R, S. (1981).
Understanding Persuation Foundation and Practice SECOND EDITION .
U.S.A:
Prentice-Hall Intrernatioal.
Gaya MLA
ROSS, RAYMOND, S..
"Understanding Persuation Foundation and Practice SECOND EDITION".
U.S.A:
Prentice-Hall Intrernatioal,
1981.
Text.