Cargile, J. (1995). qualities. in Honderich, T. (Ed.) (2005). ''The Oxford Companion to Philosophy'' (2nd ed.). Oxford.
Cargile, J. (1995). qualities. in Honderich, T. (Ed.) (2005). ''The Oxford Companion to Philosophy'' (2nd ed.). Oxford.
−
Studtmann, P. (2007). Aristotle's Categories. in Zalta, E. N. (Ed.) ''Stanford Encyclopedia of Philosophy'' (2008). Stanford. <br />
+
Studtmann, P. (2007). Aristotle's Categories. in Zalta, E. N. (Ed.) ''Stanford Encyclopedia of Philosophy'' (2008). [http://plato.stanford.edu/entries/aristotle-categories/#Quality]