APA (7th ed.) Zitazioa

Enge, E., Spencer, S., & Stricchiola, J. C. (2015). The Art of SEO: Mastering search engine optimazion (Third Edition.). O'Reilly.

Chicago Style (17th ed.) Zitazioa

Enge, Eric, Stephan Spencer, eta Jessie C. Stricchiola. The Art of SEO: Mastering Search Engine Optimazion. Third Edition. Beijing: O'Reilly, 2015.

MLA (9th ed.) Zitazioa

Enge, Eric, et al. The Art of SEO: Mastering Search Engine Optimazion. Third Edition. O'Reilly, 2015.