Não informado. (1969). Elements. University of Alberta, Department of Elementary Education.
Citação do estilo Chicago (17ª ed.)Não informado. Elements. Alberta, Canada: University of Alberta, Department of Elementary Education, 1969.
Citação MLA (8ª ed.)Não informado. Elements. University of Alberta, Department of Elementary Education, 1969.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.