APA (7th ed.) Citation

Gattegno, C. (1968). Mathematics with numbers in colour. Educational Explorers Limited.

Chicago Style (17th ed.) Citation

Gattegno, Caleb. Mathematics with Numbers in Colour. Educational Explorers Limited, 1968.

MLA (8th ed.) Citation

Gattegno, Caleb. Mathematics with Numbers in Colour. Educational Explorers Limited, 1968.

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