Hall, Arthur Graham; Frink, Fred Goodrich (јануар 1909). „Chapter II. The Acute Angle [14] Inverse trigonometric functions”. Написано на Ann Arbor, Michigan, USA. Trigonometry. Part I: Plane Trigonometry. New York, USA: Henry Holt and Company / Norwood Press / J. S. Cushing Co. - Berwick & Smith Co., Norwood, Massachusetts, USA. стр. 15. Приступљено 2017-08-12. „[…] α = arcsin m: It is frequently read "arc-sinem" or "anti-sinem," since two mutually inverse functions are said each to be the anti-function of the other. […] A similar symbolic relation holds for the other trigonometric functions. […] This notation is universally used in Europe and is fast gaining ground in this country. A less desirable symbol, α = sin-1m, is still found in English and American texts. The notation α = inv sin m is perhaps better still on account of its general applicability. […]”CS1 одржавање: Формат датума (веза)