APA (7th ed.) Citation

Koo, G. S. (2000). How to grow old and stay young. Philippine Daily Inquirer.

Chicago Style (17th ed.) Citation

Koo, Grace S. "How to Grow Old and Stay Young." Philippine Daily Inquirer 2000.

MLA (9th ed.) Citation

Koo, Grace S. "How to Grow Old and Stay Young." Philippine Daily Inquirer, 2000.

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