Albers, Henry, author
Wiley, 1974
Buku Teks
Cetron, Marvin J., author; Insenson, Raymond, author; Johnson, Jacob N., author; Nutt, Ambrose B., author; Wells, Howard A., author
M.I.T. Press, 1969
Buku Referensi
Funk & Wagnalls Company, 1949
Buku Teks
Norcross, Harold, author
Pan Books, 1971
Buku Teks
Certo, Samuel C.
Prentice-Hall, 1994
Buku Teks