APA (7th ed.) Citation

Gattegno, C. (1963). Mathematics with numbersin colour: Study of numbers. Educational Explorers Limited.

Chicago Style (17th ed.) Citation

Gattegno, Caleb. Mathematics with Numbersin Colour: Study of Numbers. Educational Explorers Limited, 1963.

MLA (8th ed.) Citation

Gattegno, Caleb. Mathematics with Numbersin Colour: Study of Numbers. Educational Explorers Limited, 1963.

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