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Fidel, R. (2012-03-23). Information Need and the Decision Ladder. In Human Information Interaction: An Ecological Approach to Information Behavior. : The MIT Press. Retrieved 21 Sep. 2021, from https://mitpress.universitypressscholarship.com/view/10.7551/mitpress/9780262017008.001.0001/upso-9780262017008-chapter-4.