Cita APA (7th ed.)

Sullivan, R. E. (1963). Aix-la-Chapelle in the age of Charlemagne. University of Oklahoma Press.

Cita Chicago (17th ed.)

Sullivan, Richard Eugene. Aix-la-Chapelle in the Age of Charlemagne. Norman,: University of Oklahoma Press, 1963.

Cita MLA (8th ed.)

Sullivan, Richard Eugene. Aix-la-Chapelle in the Age of Charlemagne. University of Oklahoma Press, 1963.