Fogelin, R. J. (1987). Understanding arguments: An introduction to informal logic (3ª ed.). Harcourt Brace Jovanovich.
Chicago-čujuhus (17. p.)Fogelin, Robert J. Understanding Arguments: An Introduction to Informal Logic. 3ª ed. Harcourt Brace Jovanovich, 1987.
MLA-čujuhus (9. p.)Fogelin, Robert J. Understanding Arguments: An Introduction to Informal Logic. 3ª ed. Harcourt Brace Jovanovich, 1987.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.