APA (7th ed.) Citation

Ellen, C., & Hedges,Betty Lou. (1970). Sizes,Shapes, and Numbers.

Chicago Style (17th ed.) Citation

Ellen, Clark, and Hedges,Betty Lou. Sizes,Shapes, and Numbers. Education Division, 1970.

MLA (9th ed.) Citation

Ellen, Clark, and Hedges,Betty Lou. Sizes,Shapes, and Numbers. 1970.

Warning: These citations may not always be 100% accurate.