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.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.