APA (7th ed.) Citation

Spinoza, B. d., Spinoza, B. d., & Elwes, R. (1989). Ethics: Including the improvement of the understanding. Prometheus Books.

Chicago Style (17th ed.) Citation

Spinoza, Benedictus de, Benedictus de Spinoza, and R.H.M Elwes. Ethics: Including the Improvement of the Understanding. Amherst, New York: Prometheus Books, 1989.

MLA (9th ed.) Citation

Spinoza, Benedictus de, et al. Ethics: Including the Improvement of the Understanding. Prometheus Books, 1989.