Não informado. (1969). Elements. University of Alberta, Department of Elementary Education.
Cita Chicago Style (17a ed.)Não informado. Elements. Alberta, Canada: University of Alberta, Department of Elementary Education, 1969.
Cita MLA (8a ed.)Não informado. Elements. University of Alberta, Department of Elementary Education, 1969.
Precaución: Estas citas no son 100% exactas.