Tohutoro APA (7th ed.)

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

Tohutoru Kātū Chicago (17th ed.)

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

Tohutoro MLA (9th ed.)

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