Não informado. (1933). American Physics Teacher. American Association of Physics Teachers.
Chicago-Zitierstil (17. Ausg.)Não informado. American Physics Teacher. New York: American Association of Physics Teachers, 1933.
MLA-Zitierstil (8. Ausg.)Não informado. American Physics Teacher. American Association of Physics Teachers, 1933.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.