I was excited to hear CRC Press was releasing Internet Searches for Vetting, Investigations, and Open-Source Intelligence, by Edward J. Appel, a retired FBI agent. His company has done work for me so I knew the quality of his work and assumed his book would be at the same level as his investigative efforts. I wasn't disappointed. … Appel develops a framework for preparation and planning of successful Internet research. He covers basic information about search engines, metasearch engines, social networking sites and search terms. I found the chapters Automation of Searching and Internet Intelligence Reporting to be the most enlightening. … delivers with content and is an easy read. It met my criteria for a successful investigations book … .
—Larry Zilliox, in the PISA Newsletter, April 2011
"The author gives a sober assessment of the challenges faced by any person engaged in Internet investigations and intelligence gathering but does not present an overly bleak picture. I highly recommend this work for private security professionals."
—Rich Petraits in Security Management, December 2011