Bigelow's Virus Troubleshooting Pocket Reference. Ken Dunham. McGraw-Hill. 2000. 0-072-12627-2. Well-meaning but not very accurate, and sometimes misleading.
Robert Slade's Guide to Computer Viruses: How to Avoid Them, How to Get Rid of Them, and How to Get Help (Second Edition). Springer. 1996. 0-387-94663-2. Four years is a long time in computing, but time has been kinder to Slade's book than most books on the subject. This was, until recently, easily the best introductory text on the subject.
Virus: Detection and Elimination. Rune Skardhamar. AP Professional. 1996. 0-12-647690-X. Seriously inaccurate in places and contains (not very good) virus code. The poor man's Mark Ludwig…
The Giant Black Book of Computer Viruses. Mark A. Ludwig.