United States. Post Office Department. (1928). Post route map of the state of Washington: Showing post offices with the intermediate distances on mail routes in operation on the 1st of January 1928. Published by order of Postmaster General Harry S. New.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)United States. Post Office Department. Post Route Map of the State of Washington: Showing Post Offices with the Intermediate Distances on Mail Routes in Operation on the 1st of January 1928. [Washington, D.C.]: Published by order of Postmaster General Harry S. New, 1928.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)United States. Post Office Department. Post Route Map of the State of Washington: Showing Post Offices with the Intermediate Distances on Mail Routes in Operation on the 1st of January 1928. Published by order of Postmaster General Harry S. New, 1928.