Chicago: Aristotle, "Book I," On the Heavens, trans. J. L. Stocks Original Sources, accessed February 15, 2025, http://www.originalsources.com/Document.aspx?DocID=6PCBRCQU6VDTFSA.
MLA: Aristotle. "Book I." On the Heavens, translted by J. L. Stocks, Original Sources. 15 Feb. 2025. http://www.originalsources.com/Document.aspx?DocID=6PCBRCQU6VDTFSA.
Harvard: Aristotle, 'Book I' in On the Heavens, trans. . Original Sources, retrieved 15 February 2025, from http://www.originalsources.com/Document.aspx?DocID=6PCBRCQU6VDTFSA.