Further reading:

Cain, S (2009) Key concepts in public relations, Houndsmill: Palgrave Macmillan
Heath, R (2013) Encyclopedia of Public Relations, 2nd edition, Thousand Oaks, CA: Sage
LaFerney, D (2007) A complete glossary of essential SEO jargon, MOZ
Whalley, B (2011) 40 essential SEO terms marketers should know, Hubspot

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