APA Citation

Williams, T. I. (1978). The twentieth century: Ca 1900 to ca 1950. Oxford: Clarendon Pr..

Chicago Style Citation

Williams, T. I. The Twentieth Century: Ca 1900 to Ca 1950. Oxford: Clarendon Pr., 1978.

MLA Citation

Williams, T. I. The Twentieth Century: Ca 1900 to Ca 1950. Oxford: Clarendon Pr., 1978.

Warning: These citations may not always be 100% accurate.