Jill Abramson, the former executive editor of The New York Times, responded on Thursday to accusations that her latest book, “Merchants of Truth,” contains passages that were plagiarized or not properly attributed to the original source material.

“I was up all night going through my book because I take these claims of plagiarism so seriously,” she said in a statement issued by the book’s publisher, Simon & Schuster. “I tried above all to accurately and properly give attribution to the many hundreds of sources that were part of my research.”

She added: “The notes don’t match up with the right pages in a few cases and this was unintentional and will be promptly corrected. The language is too close in some cases and should have been cited as quotations in the text. This, too, will be fixed.”

A Simon & Schuster spokesman said the company would work with Ms. Abramson to make corrections and clarify the sourcing in future print editions and in the e-book.