United States. National Technical Information Service. (1974). NTIS master frequency list of subject terms, July 1969 - December 1972. National Technical Information Service.
Chicago Style (17th ed.) CitationUnited States. National Technical Information Service. NTIS Master Frequency List of Subject Terms, July 1969 - December 1972. Springfield, Ill.: National Technical Information Service, 1974.
MLA (8th ed.) CitationUnited States. National Technical Information Service. NTIS Master Frequency List of Subject Terms, July 1969 - December 1972. National Technical Information Service, 1974.
Warning: These citations may not always be 100% accurate.