APA (7th ed.) Citation
Somervell, E. L. (1975). A Rhythmic approach to mathematics. The National Council of Teachers of Mathematics.
Chicago Style (17th ed.) Citation
Somervell, Edith L. A Rhythmic Approach to Mathematics. Estados Unidos: The National Council of Teachers of Mathematics, 1975.
MLA (9th ed.) Citation
Somervell, Edith L. A Rhythmic Approach to Mathematics. The National Council of Teachers of Mathematics, 1975.
Warning: These citations may not always be 100% accurate.