Voice and articulation :
Ecroyd, H. Donald
Voice and articulation : programed instruction / Donald H. Ecroyd, Murray M. Halfond, Carol Chworowsky Towne, Temple University. - Scott : Foresman and company, 1966. - 72 p.
Voice culture
Voice and articulation : programed instruction / Donald H. Ecroyd, Murray M. Halfond, Carol Chworowsky Towne, Temple University. - Scott : Foresman and company, 1966. - 72 p.
Voice culture