Peopleware and Slack by Tom DeMarco are must-reads. I re-read Peopleware once every few years. I also liked Delivering Happiness (by @zappos) and Tribal Leaders

Peopleware and Slack by Tom DeMarco are must-reads. I re-read Peopleware once every few years. I also liked Delivering Happiness (by @zappos) and Tribal Leadership, although they are more about organizations than management per se.