Schwartz, T. (1980). The art of logical reasoning. Random House.
Chicago-čujuhus (17. p.)Schwartz, Thomas. The Art of Logical Reasoning. New York: Random House, 1980.
MLA-čujuhus (9. p.)Schwartz, Thomas. The Art of Logical Reasoning. Random House, 1980.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.