APA Format
Koch, Richard. (1997).
The 80/20 Principle : the secret of achieving more with less / Richard Koch
. London :: Nicholas Brealey Publishing,.
MLA Format
Koch, Richard.
The 80/20 Principle : the secret of achieving more with less / Richard Koch
. London :: Nicholas Brealey Publishing,, 1997
Chicago Format
Koch, Richard. The 80/20 Principle : the secret of achieving more with less / Richard Koch. London :: Nicholas Brealey Publishing,, 1997.