Gripp, A. (2012). Nina Berman: Obama Train. Photonews.
Cita Chicago (17th ed.)Gripp, Anna. "Nina Berman: Obama Train." Photonews 2012.
Cita MLA (8th ed.)Gripp, Anna. "Nina Berman: Obama Train." Photonews, 2012.
Atenció: Aquestes cites poden no estar 100% correctes.