Não informado. (1899). Proceedings of the Washington Academy of Sciences. Washington Academy of Sciences.
Chicago-viite (17. p.)Não informado. Proceedings of the Washington Academy of Sciences. Washington: Washington Academy of Sciences, 1899.
MLA-viite (8. p.)Não informado. Proceedings of the Washington Academy of Sciences. Washington Academy of Sciences, 1899.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.