APA (7th ed.) Citation

Gattegno, C. (1969). Mathematics with numbers in colour. Educational Explores Limited.

Chicago Style (17th ed.) Citation

Gattegno, C. Mathematics with Numbers in Colour. Educational Explores Limited, 1969.

MLA (8th ed.) Citation

Gattegno, C. Mathematics with Numbers in Colour. Educational Explores Limited, 1969.

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