Gralla, P. (1999). The complete idiot's guide to online shopping. Alpha Books/Que.
Lua i Stíl Chicago (17ú heag.)Gralla, Preston. The Complete Idiot's Guide to Online Shopping. Indianapolis, Ind: Alpha Books/Que, 1999.
Lua MLA (9ú heag.)Gralla, Preston. The Complete Idiot's Guide to Online Shopping. Alpha Books/Que, 1999.
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