APA (7th ed.) Citation

Chadwick, D. W. (1996). Understanding X.500: The directory. International Thomson Computer Press.

Chicago Style (17th ed.) Citation

Chadwick, D. W. Understanding X.500: The Directory. London: International Thomson Computer Press, 1996.

MLA (9th ed.) Citation

Chadwick, D. W. Understanding X.500: The Directory. International Thomson Computer Press, 1996.