Image copyright Amazon Image caption The existing store offer books at the same price as they are available online
Amazon's chief executive Jeff Bezos has confirmed that the online retailer plans to build more real-world book stores.
It opened its first bricks and mortar store in Seattle in 2015, with a second to follow this summer in San Diego.
"We're definitely going to open additional stores, but how many we don't know yet," he added.
As Amazon mulls expansion into the real world, struggling clothing retailer Gap has said that it would consider allowing its clothes to be sold on Amazon.
"To not be considering Amazon and other would be - in my view - delusional," said chief executive Art Peck at the company's annual investor meeting in San Francisco.
According to a Morgan Stanley report, Amazon is the second-largest clothes retailer in the US, with only supermarket giant Walmart ahead of it.