SpringerLink (Online service), Lagarias, J. C., & Ferguson, S. (2011). The Kepler conjecture: The Hales- Ferguson proof by Thomas Hales, Samuel Ferguson. Birkhäuser.
Chicago-viite (17. p.)SpringerLink (Online service), Jeffrey C. Lagarias, ja Samuel Ferguson. The Kepler Conjecture: The Hales- Ferguson Proof by Thomas Hales, Samuel Ferguson. New York: Birkhäuser, 2011.
MLA-viite (9. p.)SpringerLink (Online service), et al. The Kepler Conjecture: The Hales- Ferguson Proof by Thomas Hales, Samuel Ferguson. Birkhäuser, 2011.
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