APA aipamena

Không rõ. (2003). An Introduction to Database Systems. NOTNXB.

Chicago Style aipamena

Không rõ. An Introduction to Database Systems. NOTNXB, 2003.

MLA aipamena

Không rõ. An Introduction to Database Systems. NOTNXB, 2003.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.