Zimmermann, W., & Cunningham, S. (1991). Visualization in teaching and learning mathematics. The Mathematical Association of America.
Chicago-čujuhus (17. p.)Zimmermann, Walter, juo Steve Cunningham. Visualization in Teaching and Learning Mathematics. Washington, D.C: The Mathematical Association of America, 1991.
MLA-čujuhus (9. p.)Zimmermann, Walter, juo Steve Cunningham. Visualization in Teaching and Learning Mathematics. The Mathematical Association of America, 1991.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.