A. Sfard. Proceedings of 21st Conference of PME-NA, стр. 23-44. Columbus, Ohio, Clearing House for Science, mathematics, and Environmental Education, (2001)
P. Eynde, E. Corte, и L. Verschaffel. Conference on Mathematics Beliefs and Their Impact on Teaching and Learning of Mathematics, Mathematical Research Institute, Oberwolfach, Germany, (1999)