Não informado. University of Iowa studies in education. University of Iowa, College of Education.
Citação do estilo Chicago (17ª ed.)Não informado. University of Iowa Studies in Education. Iowa City, Iowa: University of Iowa, College of Education.
Citação MLA (8ª ed.)Não informado. University of Iowa Studies in Education. University of Iowa, College of Education.
警告：這些引文格式不一定是100％准確.