The online retailer, Amazon, has reported a 16% rise in third-quarter profit, as its Kindle e-book reader continues to bolster sales.
Amazon made a net profit of $231m (£147m) in the three months to September, up from the $199m it made in the same period a year earlier.
Revenues rose 39% to $7.56bn.
But the firm also said that its total operating expenses rose more than 40% to $7.29bn, sending its shares down 5% in after-hours trading.
The Kindle launched in the US in 2007. Since going on sale in other countries, including the UK, in 2009, it has become Amazon's fastest-selling and best-selling item.
Revenue from Amazon's largest sales category - electronics and other general merchandise, which includes the Kindle - shot up 68% to $3.97bn.
Revenue from books, CDs, DVDs and other media grew by 14% to $3.35bn.
Looking ahead, Amazon said it expected sales in the last three months of the year to be between $12bn and $13.3bn, representing growth of between 26% and 40%.
Mike Koskuba, an analyst at Victory Capital Management, said he was confident the retailer would continue to perform well.
BBC News
