Inc has removed all e-books published by Macmillan from its website after a dispute over pricing, according to media reports.

Amazon's website, as well as the site for its Kindle e-reader, on Sunday showed titles published by Macmillan, including Sarah's Key by Tatiana de Rosnay, available only through third parties.

Publishers are widely seen to be demanding more control over prices of their e-books, as more companies like Barnes & Noble Inc and Apple Inc join the e-reader market. Apple unveiled its iPad tablet computer on Wednesday.

The New York Times and other media reported that Macmillan asked Amazon to raise the price of e-books to around $15 from $9.99.

Company officials were not immediately available for a comment.

According to statistics released by the International Digital Publishing Forum, wholesale revenue from e-book sales in the United States almost tripled in the third quarter of 2009 to $46.5 million from $13.9 million in the same period in 2008.

(Reporting by Ritsuko Ando, editing by Maureen Bavdek)