APA Style

Halvorson, Dan., Edelson, Edward. (). Sleep . : .

Chicago Style

Halvorson, Dan., Edelson, Edward. Sleep. : , . .

MLA Style

Halvorson, Dan., Edelson, Edward. Sleep. : , . .

Turabian Style

Halvorson, Dan., Edelson, Edward. Sleep. : , . .