Jensen, D. E. C. ;. D. L. F. ;. L. R. (1980). Young Children Learning Mathematics. Allyn And Bacon, Inc.
Lua i Stíl Chicago (17ú heag.)Jensen, Douglas E. Cruishank ; David L. Fitzgerald ; Linda R. Young Children Learning Mathematics. Allyn And Bacon, Inc, 1980.
Lua MLA (8ú heag.)Jensen, Douglas E. Cruishank ; David L. Fitzgerald ; Linda R. Young Children Learning Mathematics. Allyn And Bacon, Inc, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.