Donald J. Orth and Roger L. Payne (2003). "Principles, Policies, and Procedures"(PDF). United States Board on Geographic Names and Domestic Geographic Names. Diarkibkan daripada yang asal(PDF) pada January 8, 2016. Dicapai pada July 7, 2009.
Donald J. Orth and Roger L. Payne (2003). "Principles, Policies, and Procedures"(PDF). United States Board on Geographic Names and Domestic Geographic Names. Diarkibkan daripada yang asal(PDF) pada January 8, 2016. Dicapai pada July 7, 2009.