Somervell, E. L. (1975). A rhythmic approach to mathematics. National Council of Teachers of Mathematics.
芝加哥风格引文Somervell, Edith L. A Rhythmic Approach to Mathematics. [Reston, Va.]: National Council of Teachers of Mathematics, 1975.
MLA引文Somervell, Edith L. A Rhythmic Approach to Mathematics. National Council of Teachers of Mathematics, 1975.
警告：这些引文格式不一定是100％准确.