Keen (2002)

Field (2004)

Hobbs & Holt (1976)

Berman & Paisley (1984)

Eysenck (1947)

Fuller (1984)

Madon (2003)

Jahoda (1954)

Rosenthal and Jacobsen (1968)

Pennington (1986)

Parke

Huesman & Eron (1986)

Boyatzis (1995)

Charlton (2000)

Catharsis Theory

Hagell and Newbury (1994)

Williams et al (1981)

Hermmstein and Wilson

Haber and Haber (2001)