APA

El-Sheikh, . (2011). Sleep and Development. : Oxford University PressOxford University Press.

Chicago

El-Sheikh, . 2011. Sleep and Development. : Oxford University PressOxford University Press.

Harvard

El-Sheikh, . (2011). Sleep and Development. : Oxford University PressOxford University Press.

MLA

El-Sheikh, . Sleep and Development. : Oxford University PressOxford University Press. 2011.