Helfer, Karen S. books & textbook
Aging and Hearing: Causes and Consequences (Springer Handbook of Auditory Research, 72)
Helfer, Karen S. Bartlett, Edward L. Popper, Arthur N. Fay, Richard R.
Springer /2020-10-21 Hardcover / 340 Pages
isbn-10: 3030493660 / isbn-13: 9783030493660
Communication in Later Life (Butterworth-Heinemann Series in Communication Disorders)
Helfer PhD, Karen S. Huntley PhD, Ruth A.
Butterworth-Heinemann /1995-09-14 Hardcover / 251 Pages
isbn-10: 075069534X / isbn-13: 9780750695343
