United States. National Technical Information Service. (1974). NTIS master frequency list of subject terms, July 1969 - December 1972. National Technical Information Service.
Citace podle Chicago (17th ed.)United States. National Technical Information Service. NTIS Master Frequency List of Subject Terms, July 1969 - December 1972. Springfield, Ill.: National Technical Information Service, 1974.
Citace podle MLA (8th ed.)United States. National Technical Information Service. NTIS Master Frequency List of Subject Terms, July 1969 - December 1972. National Technical Information Service, 1974.
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