Não informado. (1927). Bulletin of the International Bureau of Education. International Bureau of Education.
Chicagoスタイル(17版)引用形式Não informado. Bulletin of the International Bureau of Education. Geneve, Suíça: International Bureau of Education, 1927.
MLA(8版)引用形式Não informado. Bulletin of the International Bureau of Education. International Bureau of Education, 1927.
警告: この引用は必ずしも正確ではありません.