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:Hendricks et al. had suggested that “topic shift crucially requires speakers to take into account the listener’s perspective” (p. 395, Hendriks et al., 2014), which would result in the use of definite NPs.
Category: