Hurley, P. J. A Concise Introduction to Logic. Wadsworth.
Chicago-čujuhus (17. p.)Hurley, Patrick J. A Concise Introduction to Logic. Wadsworth.
MLA-čujuhus (9. p.)Hurley, Patrick J. A Concise Introduction to Logic. Wadsworth.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.