Não informado. (1969). Elements. University of Alberta, Department of Elementary Education.
Chicago-Zitierstil (17. Ausg.)Não informado. Elements. Alberta, Canada: University of Alberta, Department of Elementary Education, 1969.
MLA-Zitierstil (8. Ausg.)Não informado. Elements. University of Alberta, Department of Elementary Education, 1969.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.