APA (7th ed.) Citation

Spinoza, B. d. (1949). Ethics preceded by On the improvement of the understanding. Hafner.

Chicago Style (17th ed.) Citation

Spinoza, Benedictus de. Ethics Preceded by On the Improvement of the Understanding. New York: Hafner, 1949.

MLA (9th ed.) Citation

Spinoza, Benedictus de. Ethics Preceded by On the Improvement of the Understanding. Hafner, 1949.

Warning: These citations may not always be 100% accurate.