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Relatives' letter of orientation to the token economy syste:

McMordie, W.R. ; Richards, L.L. ; Laughlin, P.R.
Journal of Behavior Therapy and Experimental Psychiatry.  6 (1975)  4 - p. 361-362 , 1975
Link: https://doi.org/10.1016/0005-7916(75)90084-1