National Council of Teachers of Mathematics, Aichele, D. B., & Coxford, A. F. (1994). Professional development for teachers of mathematics. National Council of Teachers of Mathematics.
Citazione stile Chigago Style (17a edizione)National Council of Teachers of Mathematics, Douglas B. Aichele, e Arthur F. Coxford. Professional Development for Teachers of Mathematics. Reston, Va: National Council of Teachers of Mathematics, 1994.
Citatione MLA (9a ed.)National Council of Teachers of Mathematics, et al. Professional Development for Teachers of Mathematics. National Council of Teachers of Mathematics, 1994.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.