(2001). DECS launches environmental educational textbook. Philippine Star.
Lua i Stíl Chicago (17ú heag.)"DECS Launches Environmental Educational Textbook." Philippine Star 2001.
Lua MLA (9ú heag.)"DECS Launches Environmental Educational Textbook." Philippine Star, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.