Chicago: Benedictus de Spinoza, "Preface," Ethics, Part 2: On the Nature and Origin of the Mind, trans. Elwes, R. H. M. (Robert Harvey Monro), 1853- in Ethics, Part 2: On the Nature and Origin of the Mind Original Sources, accessed April 3, 2025, http://originalsources.com/Document.aspx?DocID=AN7Z5PI4ZB7XRLC.
MLA: Spinoza, Benedictus de. "Preface." Ethics, Part 2: On the Nature and Origin of the Mind, translted by Elwes, R. H. M. (Robert Harvey Monro), 1853-, in Ethics, Part 2: On the Nature and Origin of the Mind, Original Sources. 3 Apr. 2025. http://originalsources.com/Document.aspx?DocID=AN7Z5PI4ZB7XRLC.
Harvard: Spinoza, BD, 'Preface' in Ethics, Part 2: On the Nature and Origin of the Mind, trans. . cited in , Ethics, Part 2: On the Nature and Origin of the Mind. Original Sources, retrieved 3 April 2025, from http://originalsources.com/Document.aspx?DocID=AN7Z5PI4ZB7XRLC.