The links below point to other resources that may be useful to you.
ASIS International http://www.asisonline.org/
International organization of security professionals; develops educational programs and materials addressing broad security concerns.
International CPTED Association http://www.cpted.net/
International association of Crime Prevention Through Environmental Design (CPTED) professionals; provides information and education on CPTED.
National Crime Prevention Council http://www.ncpc.org/
A national educational non-profit; the focal point for crime prevention information.
Terrorism Research Center http://www.terrorism.com/
An independent institute dedicated to the research of terrorism, information warfare and security, critical infrastructure protection, homeland security, and other issues of low-intensity political violence and gray-area phenomena.