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Chicago: Aristotle, "Book I," On the Heavens, trans. J. L. Stocks Original Sources, accessed June 30, 2025, http://www.originalsources.com/Document.aspx?DocID=1NJHNZHNRFKQLC3.
MLA: Aristotle. "Book I." On the Heavens, translted by J. L. Stocks, Original Sources. 30 Jun. 2025. http://www.originalsources.com/Document.aspx?DocID=1NJHNZHNRFKQLC3.
Harvard: Aristotle, 'Book I' in On the Heavens, trans. . Original Sources, retrieved 30 June 2025, from http://www.originalsources.com/Document.aspx?DocID=1NJHNZHNRFKQLC3.