Sergeant, Graham, author
Macmillan, 1973
Buku Teks
Bierstedt, Robert, author
McGraw-Hill, 1974
Buku Teks
edited by H.G. Hopkins and M.J. Sewell
Pergamon Press, 1982
Buku Teks
Berstein, Jeremy
Basic Books, 1982
Buku Teks
Masson, VeNeta
Springer Publ ., 1981
Buku Teks