APA (7th ed.) Citation

Clarke, L. H., & Norton, F. G. J. (1978). Ordinary level mathematics (6th ed.). Heinemann Educational Books.

Chicago Style (17th ed.) Citation

Clarke, Leonard Harwood, and F. G. J. Norton. Ordinary Level Mathematics. 6th ed. London: Heinemann Educational Books, 1978.

MLA (9th ed.) Citation

Clarke, Leonard Harwood, and F. G. J. Norton. Ordinary Level Mathematics. 6th ed. Heinemann Educational Books, 1978.