 "The New York Times" reported in 2013 that "we [generally do not] track the sales of classic literature," and thus, for example, new translations of Dante's "Inferno" would not be found on the bestseller list.The exact method for compiling the data obtained from the booksellers is classified as a trade secret.Book Review staff editor Gregory Cowles explained the method "is a secret both to protect our product and to make sure people can't try to rig the system.