This is a great book, easy read. The author is Tom Rath who has written several amazing (and best-selling) books on wellness, emotional IQ and leadership. This book specifically talks about how we have to take care of ourselves first in order to give to others. It talks about the value of self-care.
https://www.amazon.com/How-Full-Your-Bucket-Rath/dp/1595620036/ref=sr_1_2?ie=UTF8&qid=1519748550&sr=8-2&keywords=how+full+is+your+bucket