Leskien, August, 1840-1916
C. Winter, 1969
Buku Klasik
Saebens, Hans
Bremen Carl Schunemann Verlag 1949
Buku Teks
Jakobson, Roman, author
Berlin Akademic-Verlag 1960
Buku Teks
Heller, EK
Berkeley [etc.] University of California Press 1952
Buku Teks
Wilhelm, Richard
Buku Teks