APA

(2010). Focus on sleep medicine. Philadelphia: Lippincott Williams & Wilkins.

Chicago

2010. Focus on sleep medicine. Philadelphia: Lippincott Williams & Wilkins.

Harvard

(2010). Focus on sleep medicine. Philadelphia: Lippincott Williams & Wilkins.

MLA

Focus on sleep medicine. Philadelphia: Lippincott Williams & Wilkins. 2010.