Cita APA (7th ed.)
Freeman,Eric, & Freeman,Elisabeth. (2010). Head first design pattenrs. SPD.
Cita Chicago (17th ed.)
Freeman,Eric, i Freeman,Elisabeth. Head First Design Pattenrs. Kolkata: SPD, 2010.
Cita MLA (9th ed.)
Freeman,Eric, i Freeman,Elisabeth. Head First Design Pattenrs. SPD, 2010.
Atenció: Aquestes cites poden no estar 100% correctes.