Update README.md (#456)

* Update README.md

Addition of source references.

* Final QA

---------

Co-authored-by: Geir Arne Hjelle <[email protected]>

Author: eyrei123

jupyter-lab-files/Movies.json

@@ -9,7 +9,7 @@
     {
       "id": 1,
       "title": "Pal Joey",
-      "release_year": 1953,
+      "release_year": 1957,
       "star": "Francis Albert Sinatra"
     },
     {

jupyter-lab-files/README.md

@@ -11,3 +11,17 @@ The easiest way to incorporate these files into JupyterLab is to copy them into
 ## Usage
 
 After creating and activating your virtual environment, installing the dependencies, and starting the JupyterLab server, you can load any file by double-clicking on it from the _file browser_ in JupyterLab.
+
+## Information Sources
+
+The `howto-regex.pdf` file is a PDF copy of an [article](https://docs.python.org/3/howto/regex.html) published as part of the Python documentation. The PDF version itself was sourced from the FOSSIES [open source archive](https://fossies.org/linux/python-docs-pdf-a4/howto-regex.pdf).
+
+The population data used in this article was sourced from the [Worldometers free reference web site](https://www.worldometers.info/world-population/world-population-by-year/).
+
+Information on the effects of the changes in the world's population was sourced in the [free learning resources](https://ugc.berkeley.edu/background-content/population-growth/) provided by the University of California.
+
+All movie data was sourced from various Wikipedia articles: [List of James Bond films](https://en.wikipedia.org/wiki/List_of_James_Bond_films), [Dr. No](https://en.wikipedia.org/wiki/Dr._No_(film)), [Pal Joey](https://en.wikipedia.org/wiki/Pal_Joey_(film)), and [The Godfather](https://en.wikipedia.org/wiki/The_Godfather).
+
+`Glasgow.jpg` is a photograph of George Square in Glasgow. (C) Ian Eyre
+
+All other content was created specifically for this article.