APA (7th ed.) Citation

Great Britain. Central Computer Agency. (1979). Microcomputer operating systems. The Agency.

Chicago Style (17th ed.) Citation

Great Britain. Central Computer Agency. Microcomputer Operating Systems. London: The Agency, 1979.

MLA (8th ed.) Citation

Great Britain. Central Computer Agency. Microcomputer Operating Systems. The Agency, 1979.

Warning: These citations may not always be 100% accurate.