Gizzing H. Khanaka & William J. Orvis, Virus Information Update CIAC-2301Archived 2017-03-02 at the Wayback Machine, Department of Energy Computer Incident Advisory Capability, Lawrence Livermore National Laboratory, 21 May 1998, p. 59
Eugene H. Spafford, Kathleen A. Heaphy and David J. Ferbrache, "A Computer Virus Primer", 28 November 1989, p. 36. Computer Science Technical Reports Paper 795
Gizzing H. Khanaka & William J. Orvis, Virus Information Update CIAC-2301Archived 2017-03-02 at the Wayback Machine, Department of Energy Computer Incident Advisory Capability, Lawrence Livermore National Laboratory, 21 May 1998, p. 59