Somerset, A. (2002). Basic number skills: Why students fail in math. National Institute for Science & Mathematics Education Development.
Citazione stile Chigago Style (17a edizione)Somerset, Anthony. Basic Number Skills: Why Students Fail in Math. Diliman, Quezon City, Science and Mathematics Education Institute: National Institute for Science & Mathematics Education Development, 2002.
Citatione MLA (9a ed.)Somerset, Anthony. Basic Number Skills: Why Students Fail in Math. National Institute for Science & Mathematics Education Development, 2002.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.