Z.-W. Qian, G.-S. Wan, X.-L. Du, Y.-F. Shi, și G. Huang, „Performance Evaluation of Digital Marketing in Health Care Industry with the Application of Data Envelopment Analysis”, rcis, vol. 60, pp. 39–50, mar. 2018, Data accesării: nov. 06, 2026. Disponibil la: https://www.rcis.ro/journal/article/view/2417-performance-evaluation-of-digital-marketing-in-health-care