Deliberate Practice Readings
Freakonomics has their own take on this discussion in their episode “How To Become Great At Almost Anything”
Or, check out this video on Deliberate Practice by Sprouts, an educational YouTube channel that uses animation to explain academic theories.
There is a broad array of literature on the examination of the brains of London Cabbies. To name a few, The Scientific American, The BBC, National Center for Biotechnology Information, and Wired have substantial articles to aid your reading.