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Personal influence;

By Katz, Elihu,. Glencoe, Ill., Free Press 1955 . xx, 400 p. , Foreword : f. XV-XX | "A report of the Bureau of Applied Social Research, Columbia University." 22 cm..

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The power of real-time social media marketing :

By Macy, Beverly.. New York : McGraw-Hill, 2011 . xxii, 244 f. : , Preface: f. XV-XVII 24 cm.. 9780071752633

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