^Ghurye 1969, pp. 15–17, Quote: "This was only generally true, for there were groups of occupations like trading, agriculture, labouring in the field and doing military service which were looked upon as anybody's, and most caste were supposed to be eligible for any of them..
^Richard Gombrich (2012). "Chapter 8. Caste in the Monastery". Buddhist Precept & Practice. Routledge. pp. 343–357. ISBN978-1-136-15616-8.; According to Gombrich's study of Buddhist texts, particularly relating to castes in Sri Lankan Buddhist and Tamil Hindu society, also "The terms Vaisya and Sudra did not correspond to any clear-cut social units, even in the ancient period, but various groups were subsumed under each term (...); In medieval times (say AD 500–1500) though society was still said to consist of the four classes, this classification seems to have become irrelevant (...)"
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