“…Where arguments rely on source information, they are deemed fallacious, as, for example, with ad hominem arguments, which attack the credibility of the source, or appeals to authority, which are based on the source's credibility. Such arguments feature prominently in traditional catalogs of fallacies (e.g., Woods et al, 2004 ) and textbooks on critical thinking (e.g., Bowell and Kemp, 2002 ; Hughes et al, 2010 ; Rainbolt and Dwyer, 2012 ). However, even this tradition increasingly holds that such arguments are sometimes reasonable, and focuses on distinguishing fallacious and non-fallacious forms (e.g., Walton, 1998 ; van Eemeren et al, 2009 ).…”