United States. Post Office Department & ProQuest (Firm). (1940). Annual Report of the Postmaster General for the fiscal year ended June 30, 1940. [publisher not identified].
Chicago Style (17th ed.) CitationUnited States. Post Office Department and ProQuest (Firm). Annual Report of the Postmaster General for the Fiscal Year Ended June 30, 1940. Washington: [publisher not identified], 1940.
MLA (9th ed.) CitationUnited States. Post Office Department and ProQuest (Firm). Annual Report of the Postmaster General for the Fiscal Year Ended June 30, 1940. [publisher not identified], 1940.
Warning: These citations may not always be 100% accurate.