Cita APA (7th ed.)
ebrary, Inc, Schneider, D., & Lilienfeld, D. E. (2011). Twentieth century challenges. Rutgers University Press.
Cita Chicago (17th ed.)
ebrary, Inc, Dona Schneider, i David E. Lilienfeld. Twentieth Century Challenges. New Brunswick, N.J.: Rutgers University Press, 2011.
Cita MLA (9th ed.)
ebrary, Inc, et al. Twentieth Century Challenges. Rutgers University Press, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.