Davis, H. A. a. C. (1933). Brief course in plane and sperical trigonometry. American Book.
Lua i Stíl Chicago (17ú heag.)Davis, H. A. and Chambers. Brief Course in Plane and Sperical Trigonometry. New ork: American Book, 1933.
Lua MLA (9ú heag.)Davis, H. A. and Chambers. Brief Course in Plane and Sperical Trigonometry. American Book, 1933.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.