> La primera vez que aparece la sigla o.k. en letras de imprenta es el 23 de marzo de 1839 en el periódico Boston Morning Post, cuya autoría es atribuida a su editor, Charles Gordon Greene, con tono irónico, en el siguiente texto:
« The above is from the The Providence Journal, the editor of which is a little too quick on the trigger, on this occasion. We said not a word about our deputation passing "through the city" of Providence.—We said our brethren were going to New York in the Richmond, and they did go, as per Post of Thursday. The "Chairman of the Committee on Charity Lecture Bell…