Weekley, Ernest, author
Dover Publications, 1967
Buku Referensi
Dauzat, Albert, 1877-1955, author
Librairie Larousse, 1938
Buku Referensi
Bloch, Oscar, author
Presses Universitaires De France, 1960
Buku Referensi
Preobrazhensky, A. G., author
Columbia University Press, 1951
Buku Referensi
Gamillscheg, Ernst, author
Carl Winter's Universitatsbuchhandlung, 1928
Buku Referensi