Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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