Não informado. (1968). Educational Studies in Mathematics. D. Reidel Publishing.
Chicagoスタイル(17版)引用形式Não informado. Educational Studies in Mathematics. Dordrecht, Holanda: D. Reidel Publishing, 1968.
MLA(8版)引用形式Não informado. Educational Studies in Mathematics. D. Reidel Publishing, 1968.
警告: この引用は必ずしも正確ではありません.