Appel, E. J. (2015). Cybervetting: Internet searches for vetting, investigations, and open-source intelligence (Second Edition.). CRC Press, Taylor & Francis Press.
Lua i Stíl Chicago (17ú heag.)Appel, Edward J. Cybervetting: Internet Searches for Vetting, Investigations, and Open-source Intelligence. Second Edition. Boca Raton: CRC Press, Taylor & Francis Press, 2015.
Lua MLA (9ú heag.)Appel, Edward J. Cybervetting: Internet Searches for Vetting, Investigations, and Open-source Intelligence. Second Edition. CRC Press, Taylor & Francis Press, 2015.
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