Walker, M. P. (2018). Why we sleep: The new science of sleep and dreams. Penguin Books.
Lua i Stíl Chicago (17ú heag.)Walker, Matthew P. Why We Sleep: The New Science of Sleep and Dreams. UK: Penguin Books, 2018.
Lua MLA (9ú heag.)Walker, Matthew P. Why We Sleep: The New Science of Sleep and Dreams. Penguin Books, 2018.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.