APA (7th ed.) Citation

Zubiri, X., & Caponigri, A. R. (1980). On essence. Catholic University of America Press.

Chicago Style (17th ed.) Citation

Zubiri, Xavier, and A. Robert Caponigri. On Essence. Washington, D.C.: Catholic University of America Press, 1980.

MLA (9th ed.) Citation

Zubiri, Xavier, and A. Robert Caponigri. On Essence. Catholic University of America Press, 1980.