justificación del libro

https://docs.google.com/document/d/1LhHuXXM_-0zo3zikb34fFLsgn6vJoLMJKV3qi90IWBw/edithttps://docs.google.com/document/d/1LhHuXXM_-0zo3zikb34fFLsgn6vJoLMJKV3qi90IWBw/edit