Gaya APA
Selling : Principles and Methods. (1988).
Illinois:
Richard D Irwin, Inc.
Gaya Chicago
Selling : Principles and Methods.
Ed. 9.
Illinois:
Richard D Irwin, Inc,
1988.
.
Gaya MLA
Selling : Principles and Methods.
Ed. 9.
Illinois:
Richard D Irwin, Inc,
1988.
.
Gaya Turabian
Selling : Principles and Methods.
Illinois:
Richard D Irwin, Inc,
1988.
.