APA (7th ed.) Citation

Cumpa, J., & Tegtmeier, E. (2011). Ontological categories. Ontos Verlag.

Chicago Style (17th ed.) Citation

Cumpa, Javier, and Erwin Tegtmeier. Ontological Categories. Frankfurt: Ontos Verlag, 2011.

MLA (9th ed.) Citation

Cumpa, Javier, and Erwin Tegtmeier. Ontological Categories. Ontos Verlag, 2011.