Scott Turow, a best-selling author and president of the Authors Guild, echoes publishing-house complaints.

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Novelist Scott Turow says he's long been frustrated by the industry's failure to study its customer base.

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Calling Amazon "the Darth Vader of the literary world, " Turow said in an op-ed piece for Bloomberg last month that an Apple lawsuit would tilt the field too far in Amazon's favor.

CNN: Will Apple lawsuit mean cheaper e-books?

"I once had an argument with one of my publishers when I said, 'I've been publishing with you for a long time and you still don't know who buys my books, ' and he said, 'Well, nobody in publishing knows that, ' " says Mr. Turow, president of the Authors Guild.

WSJ: Your E-Book Is Reading You