Annual report of the Postmaster General.
APA Citation
United States Postal Service. (1989). Annual report of the Postmaster General. [Washington, D.C.: U.S. Postal Service].
MLA Citation
United States Postal Service. Annual Report of the Postmaster General. [Washington, D.C.: U.S. Postal Service], 1989.
Warning: These citations may not always be complete (especially for serials).