Lockley, S. W. (2012). Sleep: A Very Short Introduction (1st.). Oxford.
Chicago-čujuhus (17. p.)Lockley, Steven W. Sleep: A Very Short Introduction. 1st. Oxford, 2012.
MLA-čujuhus (9. p.)Lockley, Steven W. Sleep: A Very Short Introduction. 1st. Oxford, 2012.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.