50+ Successful Wharton Business School Essays: Successful Application Essays - Gain Entry to the World's Top Business Schools (Volume 1)
This book has been extremely helpful in seeing how people with similar backgrounds packaged their stories into a few essays for the adcoms. I got the book for my Wharton application but found it useful for all of the schools I'm applying to (there are similar questions). The introductions to each section give practical tips that helped me a lot.