Chicago: 
								George Washington Crile, "Preface," Origin and Nature of Emotions, trans. Macaulay, Thomas Babington Macaulay, Baron, 1800-1859 in  Origin and Nature of Emotions Original Sources, accessed November 4, 2025, http://www.originalsources.com/Document.aspx?DocID=517HB61HTMBLZPB.
								
							
							
								MLA: 
								Crile, George Washington. "Preface." Origin and Nature of Emotions, translted by Macaulay, Thomas Babington Macaulay, Baron, 1800-1859, in  Origin and Nature of Emotions, Original Sources. 4 Nov. 2025. http://www.originalsources.com/Document.aspx?DocID=517HB61HTMBLZPB.
								
							
							
								Harvard: 
								Crile, GW, 'Preface' in Origin and Nature of Emotions, trans. . cited in  1909, Origin and Nature of Emotions. Original Sources, retrieved 4 November 2025, from http://www.originalsources.com/Document.aspx?DocID=517HB61HTMBLZPB.