(1979). Working smarter. New York: Penguin Books.
Trích dẫn kiểu ChicagoWorking Smarter. New York: Penguin Books, 1979.
MLA引文Working Smarter. New York: Penguin Books, 1979.
警告：這些引文格式不一定是100％准確.
APA引文
(1979). Working smarter. New York: Penguin Books.
Trích dẫn kiểu ChicagoWorking Smarter. New York: Penguin Books, 1979.
MLA引文Working Smarter. New York: Penguin Books, 1979.