Davis, H. A. a. C. (1933). Brief course in plane and sperical trigonometry. American Book.
芝加哥风格引文Davis, H. A. and Chambers. Brief Course in Plane and Sperical Trigonometry. New ork: American Book, 1933.
MLA引文Davis, H. A. and Chambers. Brief Course in Plane and Sperical Trigonometry. American Book, 1933.
警告：这些引文格式不一定是100％准确.