Where is the world map in MMA from? How to cite it?

Questions
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1

I use GeoListPlot[] function to generate a beautiful map and write a paper. I cite the link Wolfram Mathematica: Modern Technical Computing in my paper, but the editor ask me to cite in the figure legend properly, according to Wolfram Mathematica’s tems of use (Wolfram Mathematica License Agreement). Please where is the world map from? Thank you.

2

Try something like this:

List @@ GeoGraphics[]

You will see

MetaInformation -> {"Software" -> "Wolfram Language", 
  "TileSources" -> 
   "Wolfram Knowledgebase with data from OpenStreetMap"}

Is this what you need?