Não informado. (1911). Journal of the Washington Academy of Science. Washington Academy of Sciences.
Chicago-referens (17:e uppl.)Não informado. Journal of the Washington Academy of Science. Washington: Washington Academy of Sciences, 1911.
MLA-referens (8:e uppl.)Não informado. Journal of the Washington Academy of Science. Washington Academy of Sciences, 1911.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.