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