Thanissaro Bhikkhu (2003), "Kannakatthala Sutta: At Kannakatthala" (MN 90). Retrieved 20 Nov 2008 from "Access to Insight" at http://www.accesstoinsight.org/tipitaka/mn/mn.090.than.html. This passage typifies the Buddha's dismissal of the contemporary caste system as an indicator of spiritual status.
Rhys Davids, Thomas & William Stede (eds.) (1921-5), The Pali Text Society’s Pali–English Dictionary (Chipstead: Pali Text Society), p. 135, 19 Nov 2008 from "U. Chicago" at Uḍumbara