APA (7th ed.) Citation

Great Britain. Macdonald Educational Colour Units. (1974). Calculating aids. Macdonald Educational.

Chicago Style (17th ed.) Citation

Great Britain. Macdonald Educational Colour Units. Calculating Aids. Poland, London: Macdonald Educational, 1974.

MLA (9th ed.) Citation

Great Britain. Macdonald Educational Colour Units. Calculating Aids. Macdonald Educational, 1974.

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