Ballantyne, Deborah. Handbook of audiological techniques / Deborah Ballantyne ; illustrations by Rita Troisio. - London ; Boston : Butterworth-Heinemann, 1990. - ix, 237 p. : ill. ; 24 cm. Includes index. ISBN: 0750610263 LCCN: 90002054 Subjects--Topical Terms: Audiometry.Auditory perception.Hearing aids.Audiology--methods.Auditory Perception.Hearing Aids. LC Class. No.: RF294 / .B35 1990 Dewey Class. No.: 617.8075 BAL National Library of Medicine Call No.: WV 270 B188h