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 balls usually have a theme that guides how HBC members will represent their categories for that ball event, along with core categories for each dominant gender, ‘butch queen’ (gay and bisexual men) and ‘femme queen’ (transgender women) (Galindo, 2013).
Category: