Gaya APA
Salesmanship. (1966).
Amerika:
South-Western College Publishing.
Gaya Chicago
Salesmanship.
Ed. 4.
Amerika:
South-Western College Publishing,
1966.
.
Gaya MLA
Salesmanship.
Ed. 4.
Amerika:
South-Western College Publishing,
1966.
.
Gaya Turabian
Salesmanship.
Amerika:
South-Western College Publishing,
1966.
.