NCSC-TG-002: Trusted Product Evaluations – A Guide for Vendors, 22 June 1990. (Bright Blue Book)
You can download it from the following link: https://packetstormsecurity.com/files/download/13993/NCSC-TG-002.txt
Source: https://packetstormsecurity.com/files/13993/NCSC-TG-002.txt.html