@inbook{lleo_rey_chinchilla_2019, 
  title={Measuring the Purpose Strength}, 
  DOI={10.1007/978-3-030-17674-7_10}, 
  publisher={Springer International Publishing}, 
  author={Lleo, Alvaro and Rey, Carlos and Chinchilla, Nuria}, 
  year={2019}
  }