Willerding, M. F. (1966). Elementary mathematics: Its structure and concepts. Wiley.
Citazione stile Chigago Style (17a edizione)Willerding, Margaret F. Elementary Mathematics: Its Structure and Concepts. New York: Wiley, 1966.
Citatione MLA (9a ed.)Willerding, Margaret F. Elementary Mathematics: Its Structure and Concepts. Wiley, 1966.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.