APA (7th ed.) Citation

Stern, C. (1949). Children discover arithmetic: An introduction to structural arithmetic. Harper.

Chicago Style (17th ed.) Citation

Stern, Catherine. Children Discover Arithmetic: An Introduction to Structural Arithmetic. New York: Harper, 1949.

MLA (9th ed.) Citation

Stern, Catherine. Children Discover Arithmetic: An Introduction to Structural Arithmetic. Harper, 1949.

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