U.S. National Archives and Records Service. General Services Administration. Records Management Division. (1955). Records management handbook: Managing correspondence _ plain letters. s.n.].
芝加哥风格引文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.
MLA引文U.S. National Archives and Records Service. General Services Administration. Records Management Division. Records Management Handbook: Managing Correspondence _ Plain Letters. s.n.], 1955.
警告:这些引文格式不一定是100%准确.