David W. McAlpin (1981) “வசதி”, in A Core Vocabulary for Tamil, Philadelphia: Dept. of South Asia Regional Studies, University of Pennsylvania, page [1]
N. Kathiraiver Pillai (1928) “வசதி”, in தமிழ் மொழி அகராதி [Tamil language dictionary] (in Tamil), Chennai: Pi. Ve. Namacivaya Mutaliyar