Idzikowski, C. (2019). The expert guide to sleeping well (Revised edition.). Watkins.
Citazione stile Chigago Style (17a edizione)Idzikowski, Christopher. The Expert Guide to Sleeping Well. Revised edition. London: Watkins, 2019.
Citatione MLA (9a ed.)Idzikowski, Christopher. The Expert Guide to Sleeping Well. Revised edition. Watkins, 2019.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.