APA (7th ed.) Citation

Contreras, V. (2004). DENR test for metro air quality: Check your collar. Philippine Daily Inquirer.

Chicago Style (17th ed.) Citation

Contreras, Voltaire. "DENR Test for Metro Air Quality: Check Your Collar." Philippine Daily Inquirer 2004.

MLA (9th ed.) Citation

Contreras, Voltaire. "DENR Test for Metro Air Quality: Check Your Collar." Philippine Daily Inquirer, 2004.

Warning: These citations may not always be 100% accurate.