Walczak, P. (2013). Proaktywny telemarketing. Wydawnictwo Helion.
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Chicago Style (17th ed.) Citation
Walczak, Paweł. Proaktywny Telemarketing. Gliwice: Wydawnictwo Helion, 2013.
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MLA引文
Walczak, Paweł. Proaktywny Telemarketing. Wydawnictwo Helion, 2013.
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警告：這些引文格式不一定是100％准確.