APA (7 वां संस्करण) प्रशस्ति पत्र

Villanueva, M. A. (2021). COVID-19 test first before vaccinating?. IN Commonsense [column]. Philippine Star.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Villanueva, Marichu A. "COVID-19 Test First Before Vaccinating?. IN Commonsense [column]." Philippine Star 2021.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Villanueva, Marichu A. "COVID-19 Test First Before Vaccinating?. IN Commonsense [column]." Philippine Star, 2021.