Guide for writing/modifying and following a quality selection policy. Includes information and sample language for "reconsideration" (challenged materials).
The 2012 update of the CREW Method of Weeding for Modern Librarians covers everything from the "why" to "how" of deselecting materials. Includes a section on eBooks.
The chapter on weeding from Managing and Analyzing Your Collection: A Practical Guide for Small Libraries and School Media Centers by Carol A. Doll and Pamela Petrick Barron.