Cita APA (7th ed.)

Pfänder, A., & Ferrari, D. (2009). Logic. Ontos Verlag.

Cita Chicago (17th ed.)

Pfänder, Alexander, i Donald Ferrari. Logic. Frankfurt: Ontos Verlag, 2009.

Cita MLA (9th ed.)

Pfänder, Alexander, i Donald Ferrari. Logic. Ontos Verlag, 2009.