International Correspondence Schools, & International Correspondence Schools. (1941). Plane trigonometry (1. edition.). U.S.A.: International Textbook Company.
Chicago Style CitationInternational Correspondence Schools, and International Correspondence Schools. Plane Trigonometry. 1. edition. U.S.A.: International Textbook Company, 1941.
MLA CitationInternational Correspondence Schools, and International Correspondence Schools. Plane Trigonometry. 1. edition. U.S.A.: International Textbook Company, 1941.
Warning: These citations may not always be 100% accurate.