Cita APA (7th ed.)
Sturdy, J. (1976). Numbers. Cambridge University Press.
Cita Chicago (17th ed.)
Sturdy, John. Numbers. Cambridge, [Eng.] ; New York: Cambridge University Press, 1976.
Cita MLA (9th ed.)
Sturdy, John. Numbers. Cambridge University Press, 1976.
Atenció: Aquestes cites poden no estar 100% correctes.