Sweet, W. (2004). The Philosophy of history: A re examination. Ashgate.
Chicago Style (17th ed.) ZitazioaSweet, William. The Philosophy of History: A Re Examination. Hampshie: Ashgate, 2004.
MLA (9th ed.) ZitazioaSweet, William. The Philosophy of History: A Re Examination. Ashgate, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.