APA-viite (7. p.)

Avila, H. B. (2007). Theory of legal principles. Springer.

Chicago-viite (17. p.)

Avila, Humberto Bergmann. Theory of Legal Principles. Dordrecht: Springer, 2007.

MLA-viite (9. p.)

Avila, Humberto Bergmann. Theory of Legal Principles. Springer, 2007.