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(1999-05-27). The History of Government from the Earliest Times: Volume II: The Intermediate Ages. : Oxford University Press. Retrieved 21 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198207900.001.0001/acprof-9780198207900.
The History of Government from the Earliest Times: Volume II: The Intermediate Ages. : Oxford University Press, 1999-05-27. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198207900.001.0001/acprof-9780198207900.
Finer SE. The History of Government from the Earliest Times: Volume II: The Intermediate Ages. Oxford University Press; 1999. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198207900.001.0001/acprof-9780198207900. Accessed May 21, 2013.