Não informado. (1938). The American Biology Teacher. National Association of Biology Teachers.
Cita Chicago Style (17a ed.)Não informado. The American Biology Teacher. Reston, Va: National Association of Biology Teachers, 1938.
Cita MLA (8a ed.)Não informado. The American Biology Teacher. National Association of Biology Teachers, 1938.
Precaución: Estas citas no son 100% exactas.