Villanueva, M. A. (2021). COVID-19 test first before vaccinating?. IN Commonsense [column]. Philippine Star.
Cita Chicago (17th ed.)Villanueva, Marichu A. "COVID-19 Test First Before Vaccinating?. IN Commonsense [column]." Philippine Star 2021.
Cita MLA (9th ed.)Villanueva, Marichu A. "COVID-19 Test First Before Vaccinating?. IN Commonsense [column]." Philippine Star, 2021.
Atenció: Aquestes cites poden no estar 100% correctes.