APA (7th ed.) Citation

Feys, R., & Dopp, J. (1965). Modal logics. Nauwelaerts [u.a.].

Chicago Style (17th ed.) Citation

Feys, Robert, and Joseph Dopp. Modal Logics. Louvain [u.a.]: Nauwelaerts [u.a.], 1965.

MLA (9th ed.) Citation

Feys, Robert, and Joseph Dopp. Modal Logics. Nauwelaerts [u.a.], 1965.