William B. Hurlbut & Stephen G. Post 
Altruism and Altruistic Love [PDF ebook] 
Science, Philosophy, and Religion in Dialogue

The concept of altruism, or disinterested concern for another’s welfare, has been discussed by everyone from theologians to psychologists to biologists. In this cutting edge book, evolutionary, neurological, developmental, psychological, social, cultural, and religious aspects of altruistic behavior are examined by renowned researchers. The result is a collaborative and provocative look at one of humanity’s essential and defining characteristics.