Morton O. Cooper

Winning with Your Voice

Morton O. Cooper, 1989 .

Change Your Voice, Change Your Life: A Quick, Simple Plan for Finding and Using Your Natural, Dynamic Voice

Morton Cooper, Morton O. Cooper, 1984 .

A study of the basal pitch level variations found in the normal speaking voices of males and females

Naoaki Yanagihara, N. Yanagihara, Morton Cooper, 1971 .

Vocal Suicide in Singers

Morton O. Cooper, 1970 .

Vocal Suicide in Teachers.

Morton O. Cooper, 1970 .