Hart, W. L. R. (1959). College algebra and trigonometry. Heath.
Lua i Stíl Chicago (17ú heag.)Hart, William Le Roy. College Algebra and Trigonometry. Boston: Heath, 1959.
Lua MLA (8ú heag.)Hart, William Le Roy. College Algebra and Trigonometry. Heath, 1959.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.