APA
(1980). Stammering: practical help for all ages. New York: Penguin books.
Chicago
1980. Stammering: practical help for all ages. New York: Penguin books.
Harvard
(1980). Stammering: practical help for all ages. New York: Penguin books.
MLA
Stammering: practical help for all ages. New York: Penguin books. 1980.
