Update README.md

NASA-AMMOS · Sep 17, 2022 · 2fb75be · 2fb75be
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 # PGM Loader
 
-A class in the same form as the three.js loaders for loading and parsing [PGM images](http://netpbm.sourceforge.net/doc/pgm.html).
+A class in the same form as the three.js loaders for loading and parsing PGM images ([ref 1](http://netpbm.sourceforge.net/doc/pgm.html), [ref 2](https://people.sc.fsu.edu/~jburkardt/data/pgma/pgma.html)).
 
 # Use