APA (7th ed.) Citation

Llewellyn, R. W. (1976). Information systems. Prentice-Hall.

Chicago Style (17th ed.) Citation

Llewellyn, Robert W. Information Systems. Englewood, Cliffs, New Jersey: Prentice-Hall, 1976.

MLA (9th ed.) Citation

Llewellyn, Robert W. Information Systems. Prentice-Hall, 1976.