TY - CHAP T1 - Methodology, Design, and Evaluation in Psychotherapy Research with People with Intellectual Disabilities UR - https://doi.org/10.1002/9780470713198.ch27 PY - 2004/01/01 AU - Beail N ED - DO - DOI: 10.1002/9780470713198.ch27 PB - Wiley SN - 9780471497097 SP - 531 EP - 547 Y2 - 2026/10/23 ER -