Não informado. (1969). Elements. University of Alberta, Department of Elementary Education.
Chicagoスタイル(17版)引用形式Não informado. Elements. Alberta, Canada: University of Alberta, Department of Elementary Education, 1969.
MLA(8版)引用形式Não informado. Elements. University of Alberta, Department of Elementary Education, 1969.
警告: この引用は必ずしも正確ではありません.