Blitzer, R. (2009). Introductory algebra: A custom edition for Portland Community College taken from Introductory algebra for college students (5th ed.). Pearson Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Blitzer, Robert. Introductory Algebra: A Custom Edition for Portland Community College Taken from Introductory Algebra for College Students. 5th ed. Upper Saddle River, N.J: Pearson Prentice Hall, 2009.
Lua MLA (9ú heag.)Blitzer, Robert. Introductory Algebra: A Custom Edition for Portland Community College Taken from Introductory Algebra for College Students. 5th ed. Pearson Prentice Hall, 2009.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.