Ewing, J.H., editor
Dell Publishing, 1964
Buku Teks
editors, Donald D. Carr, Norman Herz
Pergamon Press, 1989
Buku Referensi
Beckett, Kenneth A.
Grolier International, 1984
Buku Referensi
Raymond J. Corsini, editor
Wiley, 1987
Buku Referensi
edited by Derek P. Atherton, Pierre Borne
Pergamon Press, 1992
Buku Referensi