Publisher Bloomsbury says its sales of e-books has soared as the worldwide popularity of electronic readers rises.
Its comments came as it reported pre-tax profits for the 14 months to 28 February of £4.2m.
E-book sales were £1.5m, up from £79,000 last year, with chief executive Nigel Newton saying they were changing the face of the publishing industry.
"Demand for digital delivery, including e-books, is increasing significantly," Mr Newton said.
"It will change the publishing business model, creating one worldwide market," he added. "The publishing world is handling its own revolution."
Bloomsbury reported profits for a 14-month period as it is changing its financial year. In the 12 months to 31 December 2009 months profits were £7.1m.
Total group sales were £103.4m for the 14 months to February, compared with £87.2m during 2009.