Gaya APA
Ullman, Jeffrey D.. (1980).
Principles of database systems .
Rockville:
Computer Science Press.
Gaya Chicago
Ullman, Jeffrey D..
Principles of database systems.
Rockville:
Computer Science Press,
1980.
Text.
Gaya MLA
Ullman, Jeffrey D..
Principles of database systems.
Rockville:
Computer Science Press,
1980.
Text.
Gaya Turabian
Ullman, Jeffrey D..
Principles of database systems.
Rockville:
Computer Science Press,
1980.
Print.