Hanna, P. (1998). Believe achieve! penguin.
Cita Chicago (17th ed.)Hanna, Paul. Believe Achieve! New Delhi: penguin, 1998.
Cita MLA (9th ed.)Hanna, Paul. Believe Achieve! penguin, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)