Cita APA (7a ed.)

Kelley, D. R. (2006). Frontiers of history: Historical inquiry in the twentieth century. Yale University Press.

Cita Chicago Style (17a ed.)

Kelley, Donald R. Frontiers of History: Historical Inquiry in the Twentieth Century. New Haven: Yale University Press, 2006.

Cita MLA (9a ed.)

Kelley, Donald R. Frontiers of History: Historical Inquiry in the Twentieth Century. Yale University Press, 2006.