APA Style

Kryger, M, H. et al (2005). Principles and practice of sleep medicine (4th ed.). Philadelphia, PA :: Elsevier/Saunders,.

MLA Style

Kryger, Meir, H.. et al. "Principles and practice of sleep medicine". 4th ed. Philadelphia, PA :: Elsevier/Saunders,, 2005. Text.