Não informado. (1979). Focus on Learning Problems in Mathematics. Center for Teaching Learning on Mathematics.
Chicagoスタイル(17版)引用形式Não informado. Focus on Learning Problems in Mathematics. Framingham, Mass: Center for Teaching Learning on Mathematics, 1979.
MLA(8版)引用形式Não informado. Focus on Learning Problems in Mathematics. Center for Teaching Learning on Mathematics, 1979.
警告: この引用は必ずしも正確ではありません.