Leder, G. C., Pehkonen, E., & Torner, G. (2002). Beliefs: A hidden variable in mathematics education. Kluber Academic Publishers.
Citazione stile Chigago Style (17a edizione)Leder, Gilah C., Erkki Pehkonen, e Gunter Torner. Beliefs: A Hidden Variable in Mathematics Education. Dordrecht: Kluber Academic Publishers, 2002.
Citatione MLA (9a ed.)Leder, Gilah C., et al. Beliefs: A Hidden Variable in Mathematics Education. Kluber Academic Publishers, 2002.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.