Chicago: "Chapter I. Of the Principles of Pure Practical Reason.," The Critique of Practical Reason in Original Sources, accessed April 25, 2024, http://www.originalsources.com/Document.aspx?DocID=3VDG13JA3E1GT1E.
MLA: . "Chapter I. Of the Principles of Pure Practical Reason." The Critique of Practical Reason, in , Original Sources. 25 Apr. 2024. http://www.originalsources.com/Document.aspx?DocID=3VDG13JA3E1GT1E.
Harvard: , 'Chapter I. Of the Principles of Pure Practical Reason.' in The Critique of Practical Reason. cited in , . Original Sources, retrieved 25 April 2024, from http://www.originalsources.com/Document.aspx?DocID=3VDG13JA3E1GT1E.