APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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