@article{RichterZylRolletal.2021,
  author    = {Stefanie Richter and Llewellyn Ellardus van Zyl and Lara C. Roll and Marius W. Stander},
  title     = {Positive psychological coaching tools and techniques: a systematic review and classification},
  journal   = {Frontiers in psychiatry},
  volume    = {12},
  number    = {art. 667200},
  pages     = {1 -- 19},
  doi       = {10.3389/fpsyt.2021.667200},
  year      = {2021},
}