Cain, S. (2013). Quiet: The power of introverts in a world that can't stop talking. Penguin Books.
Chicago-viite (17. p.)Cain, Susan. Quiet: The Power of Introverts in a World That Can't Stop Talking. London: Penguin Books, 2013.
MLA-viite (9. p.)Cain, Susan. Quiet: The Power of Introverts in a World That Can't Stop Talking. Penguin Books, 2013.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.