De Vera, A. (2021). Health professionals oppose bill allowing LGUs to directly buy COVID-19 vaccines. Manila Bulletin.
芝加哥风格引文De Vera, Analou. "Health Professionals Oppose Bill Allowing LGUs to Directly Buy COVID-19 Vaccines." Manila Bulletin 2021.
MLA引文De Vera, Analou. "Health Professionals Oppose Bill Allowing LGUs to Directly Buy COVID-19 Vaccines." Manila Bulletin, 2021.
警告：这些引文格式不一定是100％准确.