APA (7th ed.) Citation

Chilton, P. A. (1990). X.400, the messaging and interconnection medium for the future. NCC Blackwell.

Chicago Style (17th ed.) Citation

Chilton, Paul A. X.400, the Messaging and Interconnection Medium for the Future. Manchester u.a: NCC Blackwell, 1990.

MLA (9th ed.) Citation

Chilton, Paul A. X.400, the Messaging and Interconnection Medium for the Future. NCC Blackwell, 1990.

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