Kline, John M.
Quorum Books, 1985
Buku Teks
edited by Ephraim H. Mizruchi
Appleton-Century-Crofts, 1967
Buku Teks SO
Feld, Werner J.
Pergamon Press, 1980
Buku Teks
Kohona, Palitha T.B.
Martinus Nijhoff, 1985
Buku Teks
Ebb, Lawrence F.
West Publishing, 1964
Buku Teks