The Difference by Scott Page provides scientific support for the sensibility of diversity, showing that with any given problem you actually arrive at the best, most efficient solution through having diverse perspectives represented.

Page writes: "If I formed two groups, one random (and therefore diverse) and one consisting of the best individual performers, the first group almost always did better. In my model, diversity trumped ability."

You can purchase The Difference here. We're sure it will make the difference in your firm or organization (pun intended, of course). Corny, we know. :)