Hatch, Mary Jo
Oxford University Press, 1997
Buku Teks
French, Wendell L.
Prentice-Hall International, 1990
Buku Teks
Caplo, Theodore
Harcourt, Brace & World, 1964
Buku Teks
Beneficial Management Institute, [Date of publication not identified]
Buku Teks
Thompson, Victor A.
Alfred A. Knopf, 1969
Buku Teks