(1908). The Mathematics teacher. National Council of Teachers of Mathematics.
Citazione stile Chigago Style (17a edizione)The Mathematics Teacher. Reston, Va.: National Council of Teachers of Mathematics, 1908.
Citatione MLA (9a ed.)The Mathematics Teacher. National Council of Teachers of Mathematics, 1908.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.