Price, Miles Oscar, 1890-1968, author
Little, Brown, 1979
Buku Teks
White, P.A.F., author
Macmillan, 1975
Buku Teks
Jossey-Bass Inc., Publishers, 1990
Buku Teks
Connor, Mary, author
McGraw-Hill Open university press, 2012
Buku Teks
Hesseling, P. G. M.
Pergamon Press, 1982
Buku Teks