Callon, Ross. "Use of OSI IS-IS for Routing in TCP/IP and Dual Environments." IETF RFC 1195. 1990.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/switch_c/xcprt2/xcdcef.htm.
Integrated IS-IS Commands. http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fiprrp_r/1rfisis.htm.
Intra-domain Routing Information Exchange Protocol for Use in Conjunction with the Protocol for Providing the Connectionless-mode Network Service (ISO 8473). ISO/IEC 10589. 1992.
IP routing Protocol Commands. http://www.cisco.com/univercd/cc/td/doc/product/software/ios100/rpcr/66004.htm.
IS-IS intra-domain routing information exchange protocol (ISO10589, p.37).