JOHNSON, L. M. (1994). Elementary algebra. Harper Collins College Publishers.
Lua i Stíl Chicago (17ú heag.)JOHNSON, L. Murphy. Elementary Algebra. Harper Collins College Publishers, 1994.
Lua MLA (9ú heag.)JOHNSON, L. Murphy. Elementary Algebra. Harper Collins College Publishers, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.