Luciani, M., K. Campbell, H. Tschirhart, D. Ausili, e S. M. Jack. «How to Design a Qualitative Health Research Study. Part 1: Design and Purposeful Sampling Considerations». PROFESSIONI INFERMIERISTICHE, vol. 72, n. 2, settembre 2019, https://profinf.net/pro3/index.php/IN/article/view/632.