Goodman, A., & Hirsch, L. (2000). Precalculus: Understanding functions. Brooks/Cole.
Lua i Stíl Chicago (17ú heag.)Goodman, Arthur, agus Lewis Hirsch. Precalculus: Understanding Functions. Pacific Grove, CA: Brooks/Cole, 2000.
Lua MLA (9ú heag.)Goodman, Arthur, agus Lewis Hirsch. Precalculus: Understanding Functions. Brooks/Cole, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.