Walker, M. P. (2018). Why we sleep: The new science of sleep and dreams. Penguin Books.
Citazione stile Chigago Style (17a edizione)Walker, Matthew P. Why We Sleep: The New Science of Sleep and Dreams. UK: Penguin Books, 2018.
Citatione MLA (9a ed.)Walker, Matthew P. Why We Sleep: The New Science of Sleep and Dreams. Penguin Books, 2018.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.