APA (7th ed.) Citation

Gabbay, D. M. (1994). What is a logical system? Claredon Press.

Chicago Style (17th ed.) Citation

Gabbay, Dov M. What Is a Logical System? Oxford: Claredon Press, 1994.

MLA (9th ed.) Citation

Gabbay, Dov M. What Is a Logical System? Claredon Press, 1994.

Warning: These citations may not always be 100% accurate.