NCSC-TG-016: Guidelines for Writing Trusted Facility Manuals, October 1992. (Yellow-Green Book)
You can download it from the following link: https://packetstormsecurity.com/files/download/14006/NCSC-TG-016.html
Source: https://packetstormsecurity.com/files/14006/NCSC-TG-016.html.html