Cita APA (7th ed.)

Clarke, L. H., & Norton, F. G. J. (1984). Ordinary Level mathematics (7th ed.(revised).). Heinemann Educational.

Cita Chicago (17th ed.)

Clarke, L. Harwood, i F. G. J. Norton. Ordinary Level Mathematics. 7th ed.(revised). London: Heinemann Educational, 1984.

Cita MLA (8th ed.)

Clarke, L. Harwood, i F. G. J. Norton. Ordinary Level Mathematics. 7th ed.(revised). Heinemann Educational, 1984.