Gottschalk, L. R. (1960). Understanding history: A primer of historical method. Knopf.
Lua i Stíl Chicago (17ú heag.)Gottschalk, Louis Reichenthal. Understanding History: A Primer of Historical Method. New York: Knopf, 1960.
Lua MLA (9ú heag.)Gottschalk, Louis Reichenthal. Understanding History: A Primer of Historical Method. Knopf, 1960.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.