APA Style

Allen, David. (2001). Getting things done : the art of stress free productivity . New York: Penguin Books.

Chicago Style

Allen, David. Getting things done : the art of stress free productivity. New York: Penguin Books, 2001. Printed Material.

MLA Style

Allen, David. Getting things done : the art of stress free productivity. New York: Penguin Books, 2001. Printed Material.

Turabian Style

Allen, David. Getting things done : the art of stress free productivity. New York: Penguin Books, 2001. Printed Material.