CRANDALL RICK. (1998). 1001 WAYS TO MARKET YOUR SERVICES. CONTEMPORARY BOOK.
Lua i Stíl Chicago (17ú heag.)CRANDALL RICK. 1001 WAYS TO MARKET YOUR SERVICES. U S A: CONTEMPORARY BOOK, 1998.
Lua MLA (9ú heag.)CRANDALL RICK. 1001 WAYS TO MARKET YOUR SERVICES. CONTEMPORARY BOOK, 1998.
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