Seager, Spencer L., author
St. Paul West Publishing, 1994
Buku Teks
McMurry, John, author
Prentice-Hall, 2010
Buku Teks
Petrucci, Ralph H., author
Pearson Prentice Hall, 2007
Buku Teks
Ebbing, Darrell D.
Houghton Miffiln, 1987
Buku Teks
Henrickson, Charles, author
McGraw Hil , 2011
Buku Teks