Bibliography (7):

1. Behavioral genetics of temporal framing: Heritability of time perspective and its common genetic bases with major personality traits

2. Predicting mid-life capital formation with pre-school delay of gratification and life-course measures of self-regulation

3. Patience and Comparative Development

4. Wikipedia Bibliography:

   1. Time preference

   2. Study heterogeneity

   3. Variance

   4. Calibration (statistics)