The YC partners surprisingly recommend a lot of non-tech books on Twitter. You can see their recommendations here: http://parrotread.com/bookshelf/y-combinator-partners. You can filter by genre, too.

It has Sapiens as one of Paul Grahams suggestions, but his tweet says he didn't finish it.

You might find http://parrotread.com/yc useful. It has book recommendations from all the YC partners, based on books they have tweeted about in the past.

You might find http://parrotread.com/yc useful. It has book recommendations from all YC partners, including Sam.

Checkout http://parrotread.com/yc. It has book recommendations from all YC partners, including Sam.

Goddamnyoupeople! Thanks!

The books have been determined by parsing all tweets made by YC partners in which they positively recommend a book.