Alfaray, Ricky Indra, et al. «COVID-19 and Hepatitis B Ambassador of Surabaya, Indonesia: Motivation, Commitment, and Knowledge of Youth Generation towards Health Programs in the Pandemic Era». Gaceta Médica De Caracas, vol. 129, n.º 2S, septiembre de 2021, pp. S390-S402, https://saber.ucv.ve/ojs/index.php/rev_gmc/article/view/22925.