Não informado. (2000). University of Iowa studies in social science. University of Iowa.
Chicago-Zitierstil (17. Ausg.)Não informado. University of Iowa Studies in Social Science. Iowa City, Iowa: University of Iowa, 2000.
MLA-Zitierstil (8. Ausg.)Não informado. University of Iowa Studies in Social Science. University of Iowa, 2000.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.