Lin, Yung-Wei (Dennis). Contemporary Research on Child-Centered Play Therapy (CCPT) Modalities: A Meta-Analytic Review of Controlled Outcome Studies, dissertation, May 2011; (https://digital.library.unt.edu/ark:/67531/metadc68001/m1/1/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .