http://www.myilibrary.com?id=236140
http://www.netlibrary.com/urlapi.asp?action=summary&v=1&bookid=299591
http://psi.praeger.com/doc.aspx?d=/books/gpg/C9651/C9651-156.xml
http://psi.praeger.com/doc.aspx?d=/books/gpg/C9653/C9653-166.xml
http://psi.praeger.com/doc.aspx?d=/books/gpg/C9655/C9655-185.xml
http://psi.praeger.com/doc.aspx?d=/books/gpg/C9657/C9657-175.xml
http://www.netlibrary.com/urlapi.asp?action=summary&v=1&bookid=299591
http://psi.praeger.com/doc.aspx?d=/books/gpg/C9651/C9651-156.xml
http://psi.praeger.com/doc.aspx?d=/books/gpg/C9653/C9653-166.xml
http://psi.praeger.com/doc.aspx?d=/books/gpg/C9655/C9655-185.xml
http://psi.praeger.com/doc.aspx?d=/books/gpg/C9657/C9657-175.xml