Cita APA (7th ed.)

Abbey, M. (2002). Oracle 91: A beginners guide. Mc Graw Hill Companies.

Cita Chicago (17th ed.)

Abbey, Michael. Oracle 91: A Beginners Guide. New York: Mc Graw Hill Companies, 2002.

Cita MLA (9th ed.)

Abbey, Michael. Oracle 91: A Beginners Guide. Mc Graw Hill Companies, 2002.