White, Robert W., author
Prentice-Hall, 1996
Buku Teks
Weston, J. Fred (John Fred), 1916-, author
ESG , 1981
Buku Teks
Kolb Publishing Company , 1993
Buku Teks
Eiteman, David K., author
Mass Addison-Wesley , 1992
Buku Teks
Rodriguez, Rita M., author
Prentice-Hall, 1979
Buku Teks