Não informado. (1969). Elements. University of Alberta, Department of Elementary Education.
Citace podle Chicago (17th ed.)Não informado. Elements. Alberta, Canada: University of Alberta, Department of Elementary Education, 1969.
Citace podle MLA (8th ed.)Não informado. Elements. University of Alberta, Department of Elementary Education, 1969.
Upozornění: Tyto citace jsou generovány automaticky. Nemusí být zcela správně podle citačních pravidel..