Não informado. (1927). Bulletin du Bureau International d' Education. Bureau International d' Education.
Chicago (17e ed.) BronvermeldingNão informado. Bulletin Du Bureau International D' Education. Geneve, Suíça: Bureau International d' Education, 1927.
MLA (8e ed.) BronvermeldingNão informado. Bulletin Du Bureau International D' Education. Bureau International d' Education, 1927.
Let op: Deze citaties zijn niet altijd 100% accuraat.