NCSC-TG-026: A Guide to Writing the Security Features User’s Guide for Trusted Systems, September 1991. (Hot Peach Book)
You can download it from the following link: https://packetstormsecurity.com/files/download/14018/NCSC-TG-026.txt
Source: https://packetstormsecurity.com/files/14018/NCSC-TG-026.txt.html