Não informado. (1927). Bulletin of the International Bureau of Education. International Bureau of Education.
Chicago-Zitierstil (17. Ausg.)Não informado. Bulletin of the International Bureau of Education. Geneve, Suíça: International Bureau of Education, 1927.
MLA-Zitierstil (8. Ausg.)Não informado. Bulletin of the International Bureau of Education. International Bureau of Education, 1927.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.