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+<a id="pt-spec.txt-5"></a>
+
+# References
+
+```text
+   [RFC2119]     Bradner, S., "Key words for use in RFCs to Indicate
+                 Requirement Levels", BCP 14, RFC 2119, March 1997.
+
+   [RFC1928]     Leech, M., Ganis, M., Lee, Y., Kuris, R.,
+                 Koblas, D., Jones, L., "SOCKS Protocol Version 5",
+                 RFC 1928, March 1996.
+
+   [EXTORPORT]   Kadianakis, G., Mathewson, N., "Extended ORPort and
+                 TransportControlPort", Tor Proposal 196, March 2012.
+
+   [RFC3986]     Berners-Lee, T., Fielding, R., Masinter, L., "Uniform
+                 Resource Identifier (URI): Generic Syntax", RFC 3986,
+                 January 2005.
+
+   [RFC1929]     Leech, M., "Username/Password Authentication for
+                 SOCKS V5", RFC 1929, March 1996.
+```