Cita APA (7a ed.)

Folz, R., & Ogilvie, S. A. (1969). The concept of Empire in Western Europe from the fifth to the fourteenth century (Firs published 1969.). Edward Arnold.

Cita Chicago Style (17a ed.)

Folz, Robert, y Sheila Ann Ogilvie. The Concept of Empire in Western Europe from the Fifth to the Fourteenth Century. Firs published 1969. [London]: Edward Arnold, 1969.

Cita MLA (9a ed.)

Folz, Robert, y Sheila Ann Ogilvie. The Concept of Empire in Western Europe from the Fifth to the Fourteenth Century. Firs published 1969. Edward Arnold, 1969.