Oprea, Liviu, et al. „The Chronic Care Model (CCM) and the Social Gradient in Health”. Revista de Cercetare si Interventie Sociala, vol. 41, iunie 2013, pp. 176-89, https://www.rcis.ro/journal/article/view/974-the-chronic-care-model-ccm-and-the-social-gradient-in-health.