Willerding, M. F. (1966). Elementary mathematics: Its structure and concepts. Wiley.
Lua i Stíl Chicago (17ú heag.)Willerding, Margaret F. Elementary Mathematics: Its Structure and Concepts. New York: Wiley, 1966.
Lua MLA (9ú heag.)Willerding, Margaret F. Elementary Mathematics: Its Structure and Concepts. Wiley, 1966.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.