I wouldn't recommend any books by Malcolm Gladwell. He oversimplified things for the sake of telling stories.
If you want to learn rigorously, better look toward academic sources.
If you want to learn rigorously, better look toward academic sources.
I've checked the sources from that book and they seem legit, including papers and articles[1]. Besides, the reviews of that book are very positive [2].
[1]: http://guides.skylinecollege.edu/c.php?g=279172&p=1861295 [2]: https://www.amazon.co.uk/Outliers-Story-Success-Malcolm-Glad...
Also, always read the negative reviews. Sometime, they are bunk, but they sometime can be very informative.