APA (7 वां संस्करण) प्रशस्ति पत्र

Northern, J. L., & Downs, M. P. (1991). Hearing in children (4th edition.). Williams & Wilkins.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Northern, Jerry L., और Marion P. Downs. Hearing in Children. 4th edition. Baltimore: Williams & Wilkins, 1991.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Northern, Jerry L., और Marion P. Downs. Hearing in Children. 4th edition. Williams & Wilkins, 1991.