APA (7th ed.) Citation

Gattegno, C. (1970). Mathematics with numbers in colour. Educational Exploress Limited.

Chicago Style (17th ed.) Citation

Gattegno, C. Mathematics with Numbers in Colour. Educational Exploress Limited, 1970.

MLA (8th ed.) Citation

Gattegno, C. Mathematics with Numbers in Colour. Educational Exploress Limited, 1970.

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