APA (7th ed.) Citation

Nuffield Mathematics Project. (1971). Problems--purple set. Published for the Nuffield Foundation by J.Wiley.

Chicago Style (17th ed.) Citation

Nuffield Mathematics Project. Problems--purple Set. New York: Published for the Nuffield Foundation by J.Wiley, 1971.

MLA (9th ed.) Citation

Nuffield Mathematics Project. Problems--purple Set. Published for the Nuffield Foundation by J.Wiley, 1971.

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