APA-viite (7. p.)

Ortega y Gasset, J., & Adams, M. (1971). The idea of principle in Leibnitz and the evolution of deductive theory. Norton.

Chicago-viite (17. p.)

Ortega y Gasset, Jose, ja Mildred Adams. The Idea of Principle in Leibnitz and the Evolution of Deductive Theory. New York: Norton, 1971.

MLA-viite (9. p.)

Ortega y Gasset, Jose, ja Mildred Adams. The Idea of Principle in Leibnitz and the Evolution of Deductive Theory. Norton, 1971.