Atienza, C. L. Booster shots may be necessary to raise immunity levels vs COVID-19 - expert. Manila Bulletin.
Cita Chicago (17th ed.)Atienza, Charissa Luci. "Booster Shots May Be Necessary to Raise Immunity Levels Vs COVID-19 - Expert." Manila Bulletin .
Cita MLA (9th ed.)Atienza, Charissa Luci. "Booster Shots May Be Necessary to Raise Immunity Levels Vs COVID-19 - Expert." Manila Bulletin, .
Atenció: Aquestes cites poden no estar 100% correctes.