Butterfield, H. (1973). The whig interpretation of history. Penguin Books.
Cita Chicago (17th ed.)Butterfield, Herbert. The Whig Interpretation of History. Penguin Books, 1973.
Cita MLA (9th ed.)Butterfield, Herbert. The Whig Interpretation of History. Penguin Books, 1973.
Atenció: Aquestes cites poden no estar 100% correctes.