This is pretty much the definition of a meta-source and by default stage yellow.
This guy puts effort into properly summarizing books, some shortly some more extensively. Some of his read choices are top notch personal development books.
Ever heard of a book for a long time but never took the time to read through it ? Look up for the summary here and perhaps by skimming the wisdom you will get motivated into reading the actuall book.
Enjoy and thank the writer!
