Some central works about the nature of perceptual knowledge are Dretske(1969, 2000), Goldman (1976), McDowell (1994), Williamson (2000), Johnston (2006), and Sosa (2007). Some central works about the nature of perceptual justification, entitlement and rationality are Pryor (2000), Huemer (2001), Burge (2003) and Wright (2004). Important discussions of the relationship between perceptual content and the epistemology of perception include Sellars (1956), Martin (1993), Brewer (1999), Heck (2000), and Silins (2011). Important discussions of the relationship between the metaphysics and epistemology of perception include Fumerton (1985), Martin (2006), McDowell (2006), and Sosa (2011). Pryor (2000), Huemer (2001), and Wright (2002) rank among the most important recent discussions of perception and skepticism. Pritchard (2012) and Schellenberg (2013) have developed accounts of the relationship between the epistemology of the good and the bad cases.