Cita APA (7th ed.)

Ullman, J. D. (1984). Principles of database systems. Galgotia.

Cita Chicago (17th ed.)

Ullman, Jeffrey D. Principles of Database Systems. Delhi: Galgotia, 1984.

Cita MLA (9th ed.)

Ullman, Jeffrey D. Principles of Database Systems. Galgotia, 1984.