Three Am Law 100 firms are helping two longtime book industry stalwarts seeking to turn the page on their future, as publishing grapples with the challenges posed by Amazon.com and other changes that have disrupted its traditional business model.

On Wednesday, Barnes & Noble announced the long-awaited spinoff of its struggling e-book unit Nook Media. The nation’s largest bookstore chain hopes the move to separate Nook from its more profitable brick-and-mortar retail business will increase shareholder value.