APA

Spinoza B. d., Elwes R. H. M. & NetLibrary I. (199). The ethics (Ethica ordine geometrico demonstrata). Champaign, Ill: Project Gutenberg.

Chicago

Spinoza Benedictus de, Elwes Robert Harvey Monro and NetLibrary Inc. 199. The ethics (Ethica ordine geometrico demonstrata). Champaign, Ill: Project Gutenberg.

Harvard

Spinoza B. d., Elwes R. H. M. and NetLibrary I. (199). The ethics (Ethica ordine geometrico demonstrata). Champaign, Ill: Project Gutenberg.

MLA

Spinoza Benedictus de, Elwes Robert Harvey Monro and NetLibrary Inc. The ethics (Ethica ordine geometrico demonstrata). Champaign, Ill: Project Gutenberg. 199.