Update references for new logging setup

documents/references.md

@@ -14,6 +14,8 @@ Various recommendations for using a project as a library for other projects:
 * General Library Rules, Mostly Concerning \_\_init\_\_.py:
 <https://axialcorps.wordpress.com/2013/08/29/5-simple-rules-for-building-great-python-packages/>
 * Many Recommendations for Project Structure: <https://docs.python-guide.org/writing/structure/>
+* Extended Info on Logging: <https://docs.python.org/3/howto/logging.html#logging-advanced-tutorial>
+<https://stackoverflow.com/questions/15727420/using-python-logging-in-multiple-modules>
 
 ### Git Submodules
 Since I don't know how Python projects are exported to be a pip library (and I'm not even sure if that's a good use case