TY - RPRT TI - Management guide to the protection of information resources AU - Helsing, Cheryl AU - Swanson, Marianne AU - Todd, Mary Anne PY - 1989 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST SP 500-170 DO - 10.6028/NIST.SP.500-170 ER -