Bettinger, A. K. A Modern approach to algebra and trigonometry.
Lua i Stíl Chicago (17ú heag.)Bettinger, Alvin K. A Modern Approach to Algebra and Trigonometry.
Lua MLA (9ú heag.)Bettinger, Alvin K. A Modern Approach to Algebra and Trigonometry.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.