Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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