Sommerville, J. P., & Sommerville, J. P. (1999). Royalists and patriots: Politics and ideology in England, 1603-1640 (2nd ed.). Addison Wesley Longman.

Sommerville, J. P., and J. P. Sommerville. Royalists and Patriots: Politics and Ideology in England, 1603-1640. 2nd ed. New York: Addison Wesley Longman, 1999.

Sommerville, J. P., and J. P. Sommerville. Royalists and Patriots: Politics and Ideology in England, 1603-1640. 2nd ed. Addison Wesley Longman, 1999.