Não informado. (1938). The American Biology Teacher. National Association of Biology Teachers.
Chicago-Zitierstil (17. Ausg.)Não informado. The American Biology Teacher. Reston, Va: National Association of Biology Teachers, 1938.
MLA-Zitierstil (8. Ausg.)Não informado. The American Biology Teacher. National Association of Biology Teachers, 1938.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.