Qian, Z.-W. et al. (2018) „Performance Evaluation of Digital Marketing in Health Care Industry with the Application of Data Envelopment Analysis”, Revista de Cercetare si Interventie Sociala, 60, pp. 39–50. Disponibil la: https://www.rcis.ro/journal/article/view/2417-performance-evaluation-of-digital-marketing-in-health-care (Data accesării: 6 noiembrie 2026).