Simple Network Time Protocol (SNTP), Version 4 for IPv4, IPv6 and OSI - (IETF RFC 2030) describes the Simple Network Time Protocol (SNTP) Version 4, which is an adaptation of the Network Time Protocol (NTP) used to synchronize computer clocks in the Internet, David L. Mills, October 1996
The Simple Times - publication to promote SNMP, including technical articles, featured columns, standards summaries and a list of Internet resources
SNMP FAQ - from the Usenet newsgroup comp.protocols.snmp