Krug, J. (2003, 2010). Intellectual freedom and the American Library Association: A historical overview. In Encyclopedia of Library and Information Sciences, pp.2820-2830.
This article is extremely useful in getting an overview of Intellectual Freedom and its establishment with and through the American Library Association. Intellectual freedom becomes important to understand while building collections as to not allow bias and personal preference to shape the collection. Censorship as defined by Krug in this article is “not only deletion or excision of parts of published materials but also efforts to ban, prohibit, suppress, proscribe, remove, label or restrict materials”. Very informative read on Intellectual Freedom.