Gaya APA

Maas, J, B. (1998). Power Sleep: The revolutionary program that prepares your mind for peak performance (1). New York: Quill a Imprint of Harper Collins Publisher.

Gaya MLA

Maas, James, B. "Power Sleep: The revolutionary program that prepares your mind for peak performance". 1 New York: Quill a Imprint of Harper Collins Publisher, 1998. Buku Text.