STONE, B. (1994). Successful Direct Marketing Methods Bob Stone. NTC Business Books.
Chicago-referens (17:e uppl.)STONE, Bob. Successful Direct Marketing Methods Bob Stone. NTC Business Books, 1994.
MLA-referens (8:e uppl.)STONE, Bob. Successful Direct Marketing Methods Bob Stone. NTC Business Books, 1994.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.