(1908). The Mathematics teacher. National Council of Teachers of Mathematics.
Chicago-viite (17. p.)The Mathematics Teacher. Reston, Va.: National Council of Teachers of Mathematics, 1908.
MLA-viite (9. p.)The Mathematics Teacher. National Council of Teachers of Mathematics, 1908.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.