APA (7th ed.) Citation

Central Computer and Telecommunications Agency. (1994). An Introduction to geographic information systems. HMSO.

Chicago Style (17th ed.) Citation

Central Computer and Telecommunications Agency. An Introduction to Geographic Information Systems. London: HMSO, 1994.

MLA (9th ed.) Citation

Central Computer and Telecommunications Agency. An Introduction to Geographic Information Systems. HMSO, 1994.

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