Cita APA

International Correspondence Schools, & International Correspondence Schools. (1941). Plane trigonometry (1. edition.). U.S.A.: International Textbook Company.

Citación estilo Chicago

International Correspondence Schools, y International Correspondence Schools. Plane Trigonometry. 1. edition. U.S.A.: International Textbook Company, 1941.

Cita MLA

International Correspondence Schools, y International Correspondence Schools. Plane Trigonometry. 1. edition. U.S.A.: International Textbook Company, 1941.