Cita APA (7a ed.)

Guys, C., & Roger-Marx, C. (1949). Constantin Guys: 1802-1892. Braun & Cie.

Cita Chicago Style (17a ed.)

Guys, Constantin, y Claude Roger-Marx. Constantin Guys: 1802-1892. Paris: Braun & Cie, 1949.

Cita MLA (9a ed.)

Guys, Constantin, y Claude Roger-Marx. Constantin Guys: 1802-1892. Braun & Cie, 1949.