แหล่งที่มา WikiPedia: ภาษาย่อย http://www.m-w.com/dictionary/dialect http://linguistics.berkeley.edu/~dwbruhn/dwbruhn_3... //doi.org/10.1515%2F9783110805376.531 http://www.glottopedia.org/index.php/Languoid //www.jstor.org/stable/1156320 //www.jstor.org/stable/30029461 //www.jstor.org/stable/670407 https://books.google.com/books?id=9Dz_LyQF_eAC&q=d... https://books.google.com/books?id=C3oLAQAAMAAJ https://books.google.com/books?id=DZVSAwAAQBAJ
