TY  - RPRT
TI  - Audit and evaluation of computer security 
AU  - Ruthberg, Zella G
AU  - McKenzie, Robert G
PY  - 1977
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS SP 500-19
DO  - 10.6028/NBS.SP.500-19
ER  -