Subfigure in LaTeX - Full Guide - LaTeX-Tutorial.com
4.7 Cross-referencing within documents | R Markdown Cookbook
cross referencing - Figure references with the word Figure and not just a number - TeX - LaTeX Stack Exchange
Figures, subfigures and figures side-by-side in LaTeX all you need to know. - YouTube
floats - Reference the main figure counter of several subfigures - TeX - LaTeX Stack Exchange
Reading a paper where authors have labels (red circles) in a figure and they are able to use it in the figure reference in the text as well. Thought this was pretty
How to refer to tables and figures, sections, and other parts of your paper