@article{digman1990,
  title={Personality Structure: Emergence of the Five-Factor Model},
  author={John M. Digman},
  year={1990},
  journal={Annual Review of Psychology},
  doi={10.1146/annurev.ps.41.020190.002221},
  url={https://doi.org/10.1146/annurev.ps.41.020190.002221}
}