APA-čujuhus (7. p.)
Havil, J. (2010). Nonplussed!: Mathematical proof of implausible ideas. Princeton University Press.
Chicago-čujuhus (17. p.)
Havil, Julian. Nonplussed!: Mathematical Proof of Implausible Ideas. Princeton, N.J. ; Woodstock: Princeton University Press, 2010.
MLA-čujuhus (9. p.)
Havil, Julian. Nonplussed!: Mathematical Proof of Implausible Ideas. Princeton University Press, 2010.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.