Hillman, Abraham P.
PW Publishing Company, 1994
Buku Teks
Hartley, B., author
Chapman and Hall, 1992
Buku Teks
White, Paul A., author
Dickenson, 1966
Buku Teks
Anton, Howard, author
Erlangga, 1992
Buku Teks
Noble, Ben, author
Prenticel-Hall, 1988
Buku Teks