APA (7e ed.) Bronvermelding

Willerding, M. F. (1966). Elementary mathematics: Its structure and concepts. Wiley.

Chicago (17e ed.) Bronvermelding

Willerding, Margaret F. Elementary Mathematics: Its Structure and Concepts. New York: Wiley, 1966.

MLA (9e ed.) Bronvermelding

Willerding, Margaret F. Elementary Mathematics: Its Structure and Concepts. Wiley, 1966.