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:, verbal fluency) (Benton and Hamsher 1976), Letter-Number Sequencing of the WAIS-III (Wechsler 1997), Trail Making Test (Bondy 1994; Tombaugh 2004), and Odd Man Out (Flowers and Robertson 1985) tests.
Category: