International Business Machines Corporation. Federal Systems Division & Council on Library Resources (U.S.). (1965). Report of a pilot project for converting the pre-1952 National Union Catalog to a machine-readable record.
芝加哥风格引文International Business Machines Corporation. Federal Systems Division 与 Council on Library Resources (U.S.). Report of a Pilot Project for Converting the Pre-1952 National Union Catalog to a Machine-readable Record. Rockville, Md, 1965.
MLA引文International Business Machines Corporation. Federal Systems Division 与 Council on Library Resources (U.S.). Report of a Pilot Project for Converting the Pre-1952 National Union Catalog to a Machine-readable Record. 1965.
警告：这些引文格式不一定是100％准确.