TY - GEN AU - Halvey,Christine AU - Rehfeldt,Ruth Anne TI - Expanding Vocal Requesting Repertoires via Relational Responding in Adults with Severe Developmental Disabilities SN - 0889-9401 PY - 2012///0823 N1 - Publication Type: Journal Article UR - https://doi.org/10.1007/BF03393007 ER -