Clyde, Paul Hibbert
Prentice-Hall, 1953
Buku Teks
Walker, Allan S.
Australian War Memorial, 1956
Buku Teks
Thompson, Warren S.
The University of Chicago Press, 1959
Buku Teks
Peterson, A.D.C.
Gerald Duckworth, 1949
Buku Teks
Christopher, James W.
E.J. Brill, 1928
Buku Teks