Gaya APA

Database Systems. ([s.a.]). [s.l.]: [s.n.].

Gaya Chicago

Database Systems. . [s.l.]: [s.n.], [s.a.]. Text.

Gaya MLA

Database Systems. . [s.l.]: [s.n.], [s.a.]. Text.

Gaya Turabian

Database Systems. [s.l.]: [s.n.], [s.a.]. Print.