Cita APA (7th ed.)

Ullman, J. D. (1983). Principles of database systems (2nd ed.). Computer Science Press.

Cita Chicago (17th ed.)

Ullman, Jeffrey D. Principles of Database Systems. 2nd ed. Rockville, Md: Computer Science Press, 1983.

Cita MLA (9th ed.)

Ullman, Jeffrey D. Principles of Database Systems. 2nd ed. Computer Science Press, 1983.