Cita APA (7th ed.)

Roepell, R. (1840). Geschichte Polens. Perthes.

Cita Chicago (17th ed.)

Roepell, Richard. Geschichte Polens. Hamburg: Perthes, 1840.

Cita MLA (8th ed.)

Roepell, Richard. Geschichte Polens. Perthes, 1840.