APA

(2020). The magic of sleep. New York: Harper Design, an imprint of HarperCollins Publishers.

Chicago

2020. The magic of sleep. New York: Harper Design, an imprint of HarperCollins Publishers.

Harvard

(2020). The magic of sleep. New York: Harper Design, an imprint of HarperCollins Publishers.

MLA

The magic of sleep. New York: Harper Design, an imprint of HarperCollins Publishers. 2020.