Cita APA (7a ed.)

Vries, J. d. (1952). Logica 6. Herder.

Cita Chicago Style (17a ed.)

Vries, Josef de. Logica 6. Barcelona ; Friburgh: Herder, 1952.

Cita MLA (9a ed.)

Vries, Josef de. Logica 6. Herder, 1952.