APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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