Tupas, I. Locally produced resource materials and improved textbooks. Education quarterly..
Lua i Stíl Chicago (17ú heag.)Tupas, Isabelo. "Locally Produced Resource Materials and Improved Textbooks." Education Quarterly. .
Lua MLA (9ú heag.)Tupas, Isabelo. "Locally Produced Resource Materials and Improved Textbooks." Education Quarterly., .
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.