Ortigas, T. Z. High school mathematics. [s.n.].
Lua i Stíl Chicago (17ú heag.)Ortigas, Teresa Z. High School Mathematics. [s.l. ]: [s.n.].
Lua MLA (9ú heag.)Ortigas, Teresa Z. High School Mathematics. [s.n.].
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.