Gaya APA
WINGATE, J, W., NOLAN, C, A. (1964).
FUNDAMENTALS OF SELLING (8TH ED.).
Ohio:
THE GOODHEART-WILLCOX, South Hollan.
Gaya MLA
WINGATE, JOHN, W.., NOLAN, CARROLL, A..
"FUNDAMENTALS OF SELLING".
8TH ED.
Ohio:
THE GOODHEART-WILLCOX, South Hollan,
1964.
Textbook.