Geyl, P. (1960). Debates with historians. Meridian.
Chicago Style (17th ed.) ZitazioaGeyl, Pieter. Debates with Historians. New York: Meridian, 1960.
MLA (9th ed.) ZitazioaGeyl, Pieter. Debates with Historians. Meridian, 1960.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.