edited by Robert J. Lawrie
McGraw-Hill, 1987
Buku Referensi
Hand, Augie, author
McGraw-Hill, 2011
Buku Teks
Kissell, Thomas E., author
Prentice-Hall, 1990
Buku Teks
Rosenberg, Robert, author
Holt Rinehart and Winston, 1970
Buku Teks
Phillips, R. S.
Pitman, 1978
Buku Teks