Barraclough, G. (1955). History in a changing world. University of Oklahoma Press.
Lua i Stíl Chicago (17ú heag.)Barraclough, Geoffrey. History in a Changing World. Norman: University of Oklahoma Press, 1955.
Lua MLA (8ú heag.)Barraclough, Geoffrey. History in a Changing World. University of Oklahoma Press, 1955.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.