Cita APA (7a ed.)

O'Connor, K. J., & Ammen, S. (2012). Play Therapy Treatment Planning and Interventions: The Ecosystemic Model and Workbook (2nd ed.). Elsevier Science.

Cita Chicago Style (17a ed.)

O'Connor, Kevin J., y Sue Ammen. Play Therapy Treatment Planning and Interventions: The Ecosystemic Model and Workbook. 2nd ed. Burlington: Elsevier Science, 2012.

Cita MLA (8a ed.)

O'Connor, Kevin J., y Sue Ammen. Play Therapy Treatment Planning and Interventions: The Ecosystemic Model and Workbook. 2nd ed. Elsevier Science, 2012.