APA Citation

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

Chicago Style Citation

Gattegno, Caleb. Mathematics With Numbers in Colour. Educational Explorers, 1969.

MLA Citation

Gattegno, Caleb. Mathematics With Numbers in Colour. Educational Explorers, 1969.

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