365541 Brown, S. I., & Walter, M. I. (2005). The art of problem posing. Mahwah, NJ : Lawrence Erlbaum.
Lua i Stíl Chicago (17ú heag.)365541 Brown, Stephen I., agus Marion I. Walter. The Art of Problem Posing. Mahwah, NJ : Lawrence Erlbaum, 2005.
Lua MLA (9ú heag.)365541 Brown, Stephen I., agus Marion I. Walter. The Art of Problem Posing. Mahwah, NJ : Lawrence Erlbaum, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.