De Vera, A., & Ruiz, E. (2021). COVID spread slowing down: Metro Manila's reproduction numberslips further to 0.97. Manila Bulletin.
Chicago-viite (17. p.)De Vera, Analou, ja Ellalyn Ruiz. "COVID Spread Slowing Down: Metro Manila's Reproduction Numberslips Further to 0.97." Manila Bulletin 2021.
MLA-viite (9. p.)De Vera, Analou, ja Ellalyn Ruiz. "COVID Spread Slowing Down: Metro Manila's Reproduction Numberslips Further to 0.97." Manila Bulletin, 2021.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.