It is not my habit to read books their putative authors haven't read.

From The Dirty Little Secret Behind Jen Psaki's Memoir (and Most Every Other D.C. Book) by Stephen Green.  

Books their authors didn't write bought in bulk with other people's money to end up in landfills is maybe the most Washington thing ever.

This is where I endorse George Will's comment (lightly paraphrased) about a political memoir from many years ago that he critiqued without having read: "It is not my habit to read books their putative authors haven't read."