전출처 : 포카리님의 "[서평]어떻게 차별화를 할 것인가"
http://book.interpark.com/blog/ionpocari2/3242669
http://blog.aladin.co.kr/789057196/5973409
http://booklog.kyobobook.co.kr/ionpocari/1195336
http://blog.yes24.com/document/6920012
http://cafe.naver.com/booknews/342348
http://cafe.naver.com/review3/190
http://blog.naver.com/changun75/20171851945