APA (7th ed.) Citation

Gattegno, C. (1972). Now Johnny can do arithmetic. Educational Explorers.

Chicago Style (17th ed.) Citation

Gattegno, C. Now Johnny Can Do Arithmetic. Reading: Educational Explorers, 1972.

MLA (9th ed.) Citation

Gattegno, C. Now Johnny Can Do Arithmetic. Educational Explorers, 1972.

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