Klein, P. D. (1981). Certainty: A refutation of sceptisim. University of Minnesota Press.
Chicago-čujuhus (17. p.)Klein, Peter D. Certainty: A Refutation of Sceptisim. University of Minnesota Press, 1981.
MLA-čujuhus (9. p.)Klein, Peter D. Certainty: A Refutation of Sceptisim. University of Minnesota Press, 1981.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.