• https://covid19.min-saude.pt/wp-content/uploads/2021/06/Norma_004_2021_act_08_06_2021.pdf
• https://covid19.min-saude.pt/wp-content/uploads/2021/06/Norma_003_2021_act_17_06_2021.pdf
• https://covid19.min-saude.pt/wp-content/uploads/2021/10/Norma_002_2021_act_15_10_2021.pdf
• https://covid19.min-saude.pt/wp-content/uploads/2021/07/Norma_001_2021_act_06_07_2021.pdf
• https://covid19.min-saude.pt/wp-content/uploads/2021/10/Norma_021_2020_act_10_10_2021.pdf
• https://www.dgs.pt/normas-orientacoes-e-informacoes/normas-e-circulares-normativas/norma-n-0062021-de-250920211.aspx
• https://www.dgs.pt/directrizes-da-dgs/normas-e-circulares-normativas/norma-n-0112015-de-23062015-pdf.aspx
• https://gresp.pt/ficheiros/recursos/folhetos/recomendacoes-gresp-vacinacao-anti-pneumococica.pdf