Cita APA (7a ed.)

Ullmann, W. (2010). Principles of government and politics in the Middle Ages. Routledge.

Cita Chicago Style (17a ed.)

Ullmann, Walter. Principles of Government and Politics in the Middle Ages. Abingdon, Oxon [etc.]: Routledge, 2010.

Cita MLA (9a ed.)

Ullmann, Walter. Principles of Government and Politics in the Middle Ages. Routledge, 2010.