APA (7th ed.) Citation

Ullman, J. D. (1989). Principles of database and knowledge-base systems. Computer Science Press.

Chicago Style (17th ed.) Citation

Ullman, Jeffrey D. Principles of Database and Knowledge-base Systems. Rockville, MD: Computer Science Press, 1989.

MLA (9th ed.) Citation

Ullman, Jeffrey D. Principles of Database and Knowledge-base Systems. Computer Science Press, 1989.