Não informado. (1970). Challenge in Educational Administration. Alberta Teachers Association.
Chicago-referens (17:e uppl.)Não informado. Challenge in Educational Administration. Edmonton, Canada: Alberta Teachers Association, 1970.
MLA-referens (8:e uppl.)Não informado. Challenge in Educational Administration. Alberta Teachers Association, 1970.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.