APA Style

Koch, R., Pardede, R. (2008). 80/20 principle: the secret of achieving more with less (Rev. and updated ed.). London: Nicholas Brealey.

MLA Style

Koch, Richard,., Pardede, Reslian. "80/20 principle: the secret of achieving more with less". Rev. and updated ed. London: Nicholas Brealey, 2008. print.