Cita APA (7th ed.)

Heinrich ,Wansing. (1996). Proof theory of modal logic. Kluwer Academic.

Cita Chicago (17th ed.)

Heinrich ,Wansing. Proof Theory of Modal Logic. Dordrecht: Kluwer Academic, 1996.

Cita MLA (9th ed.)

Heinrich ,Wansing. Proof Theory of Modal Logic. Kluwer Academic, 1996.