Setterwall, Ake
P.A. Norstedt & SonersForlag, 1948
Buku Teks
Princeton University Press, 1979
Buku Teks
Hurlimann, Martin, author
Charles E. Tuttle, 1970
Buku Teks
The Johns Hopkins Press, 1954
Buku Teks
Singer, J. David
Westview Press , 1990
Buku Teks