Não informado. (2000). University of Iowa studies in sociology, economics, politics and history. University of Iowa.
Citação do estilo Chicago (17ª ed.)Não informado. University of Iowa Studies in Sociology, Economics, Politics and History. Iowa City, Iowa: University of Iowa, 2000.
Citação MLA (8ª ed.)Não informado. University of Iowa Studies in Sociology, Economics, Politics and History. University of Iowa, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.