@article{marrone1987,
  title={Nursing Research: Principles and Methods},
  author={Stephen R. Marrone},
  year={1987},
  journal={AORN Journal},
  doi={10.1016/s0001-2092(07)69731-2},
  url={https://doi.org/10.1016/s0001-2092(07)69731-2}
}