Collingwood, R. G. (1961). The idea of history. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Collingwood, Robin George. The Idea of History. Londres: Oxford University Press, 1961.
Lua MLA (9ú heag.)Collingwood, Robin George. The Idea of History. Oxford University Press, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.