Add references.

pep-0383.txt

@@ -64,18 +64,19 @@ Specification
 
 On Windows, Python uses the wide character APIs to access
 character-oriented APIs, allowing direct conversion of the
-environmental data to Python str objects.
+environmental data to Python str objects ([1]).
 
 On POSIX systems, Python currently applies the locale's encoding to
 convert the byte data to Unicode, failing for characters that cannot
 be decoded. With this PEP, non-decodable bytes will be represented as
 lone half surrogate codes U+DCxx.
 
-To convert non-decodable bytes, a new error handler "python-escape" is
-introduced, which produces these half surrogates. On encoding, the
-error handler converts the half surrogate back to the corresponding
-byte. This error handler will be used in any API that receives or
-produces file names, command line arguments, or environment variables.
+To convert non-decodable bytes, a new error handler ([2])
+"python-escape" is introduced, which produces these half
+surrogates. On encoding, the error handler converts the half surrogate
+back to the corresponding byte. This error handler will be used in any
+API that receives or produces file names, command line arguments, or
+environment variables.
 
 The error handler interface is extended to allow the encode error
 handler to return byte strings immediately, in addition to returning
@@ -122,6 +123,17 @@ for accepting and returning bytes, would be written as::
           # fn is now a str object
           yield fn.encode(fse, "python-escape")
 
+References
+==========
+
+  [1] PEP 277
+      "Unicode file name support for Windows NT"
+      http://www.python.org/dev/peps/pep-0277/
+
+  [2] PEP 293
+      "Codec Error Handling Callbacks"
+      http://www.python.org/dev/peps/pep-0293/
+
 Copyright
 =========