U.S. National Archives and Records Service. General Services Administration. Records Management Division. (1955). Records management handbook: Managing correspondence _ plain letters. s.n.].
Cita Chicago Style (17a ed.)U.S. National Archives and Records Service. General Services Administration. Records Management Division. Records Management Handbook: Managing Correspondence _ Plain Letters. [S.l: s.n.], 1955.
Cita MLA (9a ed.)U.S. National Archives and Records Service. General Services Administration. Records Management Division. Records Management Handbook: Managing Correspondence _ Plain Letters. s.n.], 1955.
Precaución: Estas citas no son 100% exactas.