Цитирование APA (7-е изд.)
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.
Цитирование в стиле Чикаго (17-е изд.)
ebrary, Inc, Alexis D. Gutzman, Anthony Muller, Donna Pfledderer, и 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.
Цитирование MLA (9-е изд.)
ebrary, Inc, et al. Buyers' Guide to Search Engine Optimization Firms: Who Should You Hire? How Much Should You Pay? 2nd ed. MarketingSherpa, 2002.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.