Contingency management voucher redemption as an indicator of delayed gratification

Fletcher JB, Dierst-Davies R, Reback CJ (2014). Contingency management voucher redemption as an indicator of delayed gratification. Journal of Substance Abuse Treatment. 47(1):73-7. doi: 10.1016/j.jsat.2014.03.003. Epub 2014 Mar 12.PMID:24674235.