6. References (参考文献)

6.1. Normative References (规范性参考文献)

[US-ASCII]
American National Standards Institute, "Coded Character Set -- 7-bit American Standard Code for Information Interchange", ANSI X3.4, 1986.

6.2. Informative References (信息性参考文献)

[RFC2234]
Crocker, D. and P. Overell, "Augmented BNF for Syntax Specifications: ABNF", RFC 2234, November 1997.

[RFC4234]
Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax Specifications: ABNF", RFC 4234, October 2005.

[RFC733]
Crocker, D., Vittal, J., Pogran, K., and D. Henderson, "Standard for the Format of ARPA Network Text Message", RFC 733, November 1977.

[RFC822]
Crocker, D., "Standard for the Format of ARPA Internet Text Messages", STD 11, RFC 822, August 1982.