TY  - BOOK
AU  - Pettala, Ramakrishna
TI  - Assistive technology and hearing impairment
SN  - 9388854217
U1  - 617.89 PET 
PY  - 2020///
CY  - New Delhi
PB  - Discovery Publishing House Pvt. Ltd.
KW  - Hearing aids
KW  - Deafness--Treatment
KW  - Communication devices for people with disabilities
ER  -