APA (7 वां संस्करण) प्रशस्ति पत्र

U.S. National Archives and Records Service. General Services Administration. Records Management Division. (1955). Records management handbook: Managing correspondence _ plain letters. s.n.].

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

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.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

U.S. National Archives and Records Service. General Services Administration. Records Management Division. Records Management Handbook: Managing Correspondence _ Plain Letters. s.n.], 1955.