Underwood, James R., author
John Wiley, 1998.
Buku Teks
Underwood, Rod
John Wiley & Sons, 2007
Buku Teks
Underwood, James R., author
John Wiley & Sons, 1998
Buku Referensi
Underwood, James R., author
Wiley, 2007
Buku Teks
Ochshorn, Jonathan, author
Elsevier, 2010
Buku Teks