Cita APA (7th ed.)

Freytag Löringhoff, B. B. v., & Brekle, H. E. (1967). L' art de penser: La logique de Port-Royal. Friedrich Frommann.

Cita Chicago (17th ed.)

Freytag Löringhoff, Bruno Baron von, i Herbert E. Brekle. L' Art De Penser: La Logique De Port-Royal. Stuttgart: Friedrich Frommann, 1967.

Cita MLA (9th ed.)

Freytag Löringhoff, Bruno Baron von, i Herbert E. Brekle. L' Art De Penser: La Logique De Port-Royal. Friedrich Frommann, 1967.