APA (7 वां संस्करण) प्रशस्ति पत्र

Calayag, K. (2021). IATF brings back contact tracing app as Covid-19 cases rise. Manila Times.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Calayag, Keith. "IATF Brings Back Contact Tracing App as Covid-19 Cases Rise." Manila Times 2021.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Calayag, Keith. "IATF Brings Back Contact Tracing App as Covid-19 Cases Rise." Manila Times, 2021.