Bibliography (8):

1. The role of deliberate practice in the acquisition of expert performance

2. https://scottbarrykaufman.com/wp-content/uploads/2014/07/Macnamara-et-al.-2014.pdf

3. Deliberate practice: Is that all it takes to become an expert?

4. Wikipedia Bibliography:

   1. Reproducibility

   2. Practice (learning method) § Deliberate practice  :

      https://en.wikipedia.org/wiki/Practice_(learning_method)#Deliberate_practice

   3. Effect size

   4. Variance

   5. Meta-analysis