We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleShaping cocaine abstinence by successive approximation.AuthorsPreston, Kenzie L.; Umbricht, Annie; Wong, Conrad J.; Epstein, David H.PublicationJournal of Consulting and Clinical Psychology, 2001, Vol 69, Issue 4, p643ISSN0022-006XDOI10.1037/0022-006x.69.4.643