APA (7th ed.) Citation

Irwin, A. (1980). Stammering: A practical help for all ages. Penguin Books.

Chicago Style (17th ed.) Citation

Irwin, Ann. Stammering: A Practical Help for All Ages. Harmondsworth: Penguin Books, 1980.

MLA (9th ed.) Citation

Irwin, Ann. Stammering: A Practical Help for All Ages. Penguin Books, 1980.