APA-viite (7. p.)
Schaefer, C. E., & Drewes, A. A. (2014). The therapeutic powers of play: 20 core agents of change (Second edition.). John Wiley & Sons, Inc..
Chicago-viite (17. p.)
Schaefer, Charles E., ja Athena A. Drewes. The Therapeutic Powers of Play: 20 Core Agents of Change. Second edition. Hoboken, New Jersey: John Wiley & Sons, Inc., 2014.
MLA-viite (9. p.)
Schaefer, Charles E., ja Athena A. Drewes. The Therapeutic Powers of Play: 20 Core Agents of Change. Second edition. John Wiley & Sons, Inc., 2014.
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