Grossnickle, F. E. (1963). Discovering meanings in elementary school mathematics (4th edition.). Holt, Rinehart and Winston, Inc.
Lua i Stíl Chicago (17ú heag.)Grossnickle, Foster E. Discovering Meanings in Elementary School Mathematics. 4th edition. New York: Holt, Rinehart and Winston, Inc, 1963.
Lua MLA (9ú heag.)Grossnickle, Foster E. Discovering Meanings in Elementary School Mathematics. 4th edition. Holt, Rinehart and Winston, Inc, 1963.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.