M. Nijhoff Publishers, 1994
Buku Teks
Wheare, K. C.
Oxford University Press, 1963
Buku Teks
McWhinney, Edward, author
A.W. Sijthoff, 1966
Buku Teks
Filippov, Mikhail, author
Cambridge University Press, 2003
Buku Teks
Joske, Percy Ernest, author
Butterworth, 1967
Buku Teks