Não informado. (1970). Challenge in Educational Administration. Alberta Teachers Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Challenge in Educational Administration. Edmonton, Canada: Alberta Teachers Association, 1970.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Challenge in Educational Administration. Alberta Teachers Association, 1970.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.