Zimmermann, W., & Cunningham, S. (1991). Visualization in teaching and learning mathematics. The Mathematical Association of America.
Čikaški stil citiranja (17. izdanje)Zimmermann, Walter, i Steve Cunningham. Visualization in Teaching and Learning Mathematics. Washington, D.C: The Mathematical Association of America, 1991.
MLA način citiranja (9. izdanje)Zimmermann, Walter, i Steve Cunningham. Visualization in Teaching and Learning Mathematics. The Mathematical Association of America, 1991.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.