@article{ZylRollStanderetal.2020,
  author    = {Llewellyn Ellardus van Zyl and Lara C. Roll and Marius W. Stander and Stefanie Richter},
  title     = {Positive psychological coaching definitions and models: a systematic literature review},
  journal   = {Frontiers in psychology},
  volume    = {11},
  doi       = {10.3389/fpsyg.2020.00793},
  year      = {2020},
}