Nhung Nguyen

Key scholars Gabriel Tarde, Friedrich Ratzel and Leo Frobenius (century 19) Ryan and Gross (1943) Everett Rogers (2003)

Key scholars Richard Petty John Cacioppo

Key scholars Joseph Klapper L. Festinger P. Fischer

Key scholars Robert Park (1922) Kurt Zadek Lewin (1943) David Manning White, a journalism professor at Boston University (1950) Pamela Shoemaker, Martin Eichholz, Eunyi Kim, and Brenda Wrigley (2001, 2009, 2011)

Key scholars W. Phillips Davison A.C. Gunther V. Price J. Cohen