Davis, H. A. a. C. (1933). Brief course in plane and sperical trigonometry. American Book.
Citazione stile Chigago Style (17a edizione)Davis, H. A. and Chambers. Brief Course in Plane and Sperical Trigonometry. New ork: American Book, 1933.
Citatione MLA (9a ed.)Davis, H. A. and Chambers. Brief Course in Plane and Sperical Trigonometry. American Book, 1933.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.