  == WP relies on Reliable Sources, not non-commercial sources ==  BMK-  Your reverts do not belong on WP whatsoever.  WP relies on reliable sources, not non-commercial sources.  The New York Times and Time are 100% commercial, they are cited 1000s of times.  It's perfectly acceptable to cite any of their articles hidden behind paywalls even.  If you were to engage on a one-editor campaign to purge all references to these two sites, or even just the ones hidden behind a paywall, you'd very very quickly be banned as a vandal.  Frankly, there's no difference to your purging relevant mentions of Amazon from this page.  For what it's worth, BookFinder is 100% commercial.  It's a wholly owned subsidiary of AbeBooks.  AbeBooks puts money maintaining BookFinder not because they are engaged in a bibliophile's dream website (back in the day when it had been founded as MXBF, for example) but because it's good for their bottom line, links to competitors notwithstanding.  And besides, four of the six listings were to Amazon!  Finally, any such link is temporary, as I mentioned in my edit summary.  Once the book is published, it counts as its own reference.  The only pre-publication citations that remain will be published press releases, especially if they have some quotation from the author.  We do leave out any cruft from Amazon.  Customer comments and Amazon rankings and the like.  Anyway, I am going to revert your edit.  Feel free to add that second commercial citation if you wish, although the point of such escapes me.  Much much better would be a citation from a commercial source like the New York Times passing on commercial information fed to them from Lethem's publisher, and I'd have no objection to such a source replacing the Amazon citation.  If Lethem updates his webpage, we'll cite that in addition to a commercial reference like Amazon or BookFinder.  In addition, not in place of, simply because of WP:SELFPUBLISH.  Having the publisher let its go-betweens know something is going to happen is always more reliable than an author saying he has things in the pipeline.  (Cf. Jasper Fforde.)   