Gaya APA
Weitz, B, A. et al (1981).
SELLING: PRINCIPLES AND METHODS (Seventh edition).
HOMEWOOD, ILLINOIS:
Richard D. Irwin.
Gaya MLA
Weitz, Barton, A.. et al.
"SELLING: PRINCIPLES AND METHODS".
Seventh edition
HOMEWOOD, ILLINOIS:
Richard D. Irwin,
1981.
Textbook.