Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:…the source and target domains that makes the target sentence easier to process: When people are already thinking of a lawyer as a boxer, they can process a target sentence that extends this metaphor more quickly (Bowdle & Gentner, 2005; Gibbs, 2011; Giora, 2003; Thibodeau & Durgin, 2008).
Category: