Não informado. (1976). Essence. York University, Atkinson College, Department of Psychology.
Chicago-Zitierstil (17. Ausg.)Não informado. Essence. Ontario, Canada: York University, Atkinson College, Department of Psychology, 1976.
MLA-Zitierstil (8. Ausg.)Não informado. Essence. York University, Atkinson College, Department of Psychology, 1976.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.