New York City ? New copies of Hilary Mantel’s “Wolf Hall,” Andrew Young’s “The Politician” and other books published by Macmillan were unavailable Saturday on Amazon.com, a drastic step in the ongoing dispute over e-book prices.

Macmillan CEO John Sargent said he was told Friday that its books would be removed from Amazon.com, as would e-books for Amazon’s Kindle e-reader. Books will be available on Amazon.com through private sellers and other third parties, Sargent said.

Sargent met with Amazon officials Thursday to discuss the publisher’s new pricing model for e-books. He wrote in a letter to Macmillan authors and literary agents Saturday that the plan would allow Amazon to make more money selling Macmillan books and that Macmillan would make less. He characterized the dispute as a disagreement over “the long-term viability and stability of the digital book market.”