Hirsch, L., & Goodman, A. (1998). Understanding intermediate algebra: A course for college students (4th ed.). Brooks/Cole.
Lua i Stíl Chicago (17ú heag.)Hirsch, Lewis, agus Arthur Goodman. Understanding Intermediate Algebra: A Course for College Students. 4th ed. Pacific Grove, CA: Brooks/Cole, 1998.
Lua MLA (9ú heag.)Hirsch, Lewis, agus Arthur Goodman. Understanding Intermediate Algebra: A Course for College Students. 4th ed. Brooks/Cole, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.