A factor analytic study on the twelve item general health questionnaire.

@article{Worsley1977AFA,
  title={A factor analytic study on the twelve item general health questionnaire.},
  author={Anthony Worsley and C C Gribbin},
  journal={The Australian and New Zealand journal of psychiatry},
  year={1977},
  volume={11 4},
  pages={260-72}
}