Citações do registo
Citação norma APA
ebrary, Inc, Gutzman, A. D., Muller, A., Pfledderer, D., & Gibbons, T. (2002). Buyers' guide to search engine optimization firms: Who should you hire? how much should you pay? (2nd ed.). MarketingSherpa.
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Citação norma Chicago
ebrary, Inc, Alexis D. Gutzman, Anthony Muller, Donna Pfledderer, and Tim Gibbons. Buyers' Guide to Search Engine Optimization Firms: Who Should You Hire? How Much Should You Pay? 2nd ed. Portsmouth, R.I.: MarketingSherpa, 2002.
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Citação norma MLA
ebrary, Inc, et al. Buyers' Guide to Search Engine Optimization Firms: Who Should You Hire? How Much Should You Pay? 2nd ed. MarketingSherpa, 2002.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.