Cita APA (7th ed.)

O'Brien,Derek. (2003). Business quiz book (NA.). Penguin Books.

Cita Chicago (17th ed.)

O'Brien,Derek. Business Quiz Book. NA. New Delhi: Penguin Books, 2003.

Cita MLA (9th ed.)

O'Brien,Derek. Business Quiz Book. NA. Penguin Books, 2003.

Atenció: Aquestes cites poden no estar 100% correctes.