Wheeler, Ruric E., author
John Wiley & Sons, 1996
Buku Teks
Barnett, Raymond A., author
Dellen, 1981
Buku Teks
Haag, Vincent H.
Holt, Rinehart and Winston, 1968
Buku Teks
Boas, Mary L.
John Wiley & Sons, 1983
Buku Teks
Juszli, Frank L.
Prentice-Hall, 1969
Buku Teks