"The enduring American press: texts of talks given by a panel of distinguished journalists and scholars at a symposium marking the 200th anniversary of the Hartford Courant, Hartford, Connecticut". Book by The Hartford Courant, 1964.
Quoted in Reader's Digest, Sept. 1949. According to Nigel Rees, Cassell's Humorous Quotations, the following appeared in Punch in 1924: " 'It took me nearly ten years to learn that I couldn't write.' 'I suppose you gave it up then?' 'Oh, no! By that time I had a reputation established.' " The issue referred to by Rees is 6 Feb., and the cartoonist is R. Curry.