Manual of phonetics - Kaiser, L. (North-Holland Publishing Company, 1957)
Internacional Congresses of Phonetic Sciences 1932, 1935, 1938 u Amsterdamu, Londonu, Ghent. 1948 Internacional Congress of Anthropology - Brussels. Grupa autora:G.Panoncelli-Calzia, Trendelenburg, F.,G.E.Arnold, N.R.French, A.Gemelli, J.W.Black, E.B.Newman, G.E.Peterson, J.D.Subtelny, S.Pruzansky, H.L.Barney, R.Jacobson, M.Halle, A.Martinet, G.Hammarstrom, L.F.Brosnahan, B.Hala, A.Sovijarvi, W.Leslau, A.Burssens, R.Luchsinger, A.Sommerfelt, J.Smits van Waesberghe, A.W.de Groot, O.C.Irwin, E.Buyssens, F .Trojan