Não informado. (1994). Mathematics Teaching in the Middle School. National Council of Teachers of Mathematics.
Citação do estilo Chicago (17ª ed.)Não informado. Mathematics Teaching in the Middle School. Reston, Va: National Council of Teachers of Mathematics, 1994.
Citação MLA (8ª ed.)Não informado. Mathematics Teaching in the Middle School. National Council of Teachers of Mathematics, 1994.
警告：这些引文格式不一定是100％准确.