Great Britain. Macdonald Educational Colour Units. (1974). Numbers and patterns. Macdonald Educational.
Cita Chicago (17th ed.)Great Britain. Macdonald Educational Colour Units. Numbers and Patterns. London: Macdonald Educational, 1974.
Cita MLA (9th ed.)Great Britain. Macdonald Educational Colour Units. Numbers and Patterns. Macdonald Educational, 1974.
Atenció: Aquestes cites poden no estar 100% correctes.