APA (7e ed.) Bronvermelding

Cofman, J. (1995). Numbers and shapes revisited: More problems for young mathematicians. Clarendon Press.

Chicago (17e ed.) Bronvermelding

Cofman, Judita. Numbers and Shapes Revisited: More Problems for Young Mathematicians. Oxford, [Eng.]: Clarendon Press, 1995.

MLA (9e ed.) Bronvermelding

Cofman, Judita. Numbers and Shapes Revisited: More Problems for Young Mathematicians. Clarendon Press, 1995.