Gregory, A. (2015). Planning and Managing Public Relations Campaigns A Strategic Approach 4th Ed. Kogan Page.
Lua i Stíl Chicago (17ú heag.)Gregory, Anne. Planning and Managing Public Relations Campaigns A Strategic Approach 4th Ed. Kogan Page, 2015.
Lua MLA (8ú heag.)Gregory, Anne. Planning and Managing Public Relations Campaigns A Strategic Approach 4th Ed. Kogan Page, 2015.
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