Não informado. University of Iowa studies in character. Institute of Character Research.
Chicago-Zitierstil (17. Ausg.)Não informado. University of Iowa Studies in Character. Iowa City, Iowa: Institute of Character Research.
MLA-Zitierstil (8. Ausg.)Não informado. University of Iowa Studies in Character. Institute of Character Research.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.