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Chicago: "Chapter I. Of the Principles of Pure Practical Reason.," The Critique of Practical Reason in Original Sources, accessed June 30, 2025, 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. 30 Jun. 2025. 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 30 June 2025, from http://www.originalsources.com/Document.aspx?DocID=3VDG13JA3E1GT1E.