APA (7th ed.) Citation

Spinoza, B. d., & Boyle, A. Ethics. Heron Books.

Chicago Style (17th ed.) Citation

Spinoza, Benedictus de, and Andrew Boyle. Ethics. London: Heron Books.

MLA (8th ed.) Citation

Spinoza, Benedictus de, and Andrew Boyle. Ethics. Heron Books.

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