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APA Citation
Catania, A. C., Reilly, M. P., Hand, D., Kehle, L. K., Valentine, L., & Shimoff, E. (n.d.). a quantitative analysis of the behavior maintained by delayed reinforcers. Journal of the experimental analysis of behavior, 103(2), 288–331. http://access.bl.uk/ark:/81055/vdc_100025143602.0x000024