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:Finally, our results indicate that sustainability planning focused on securing additional funds and aligning the program with the implementing organization is a key predictor of sustainability across program types, thus supporting sustainability theory (Johnson et al. 2004) and previous empirical work with this sample (Tibbits et al.
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