David Halperin (USA)
- Twitter - David Halperin152398
- Republic Report: David Halperin152399
- Huff Post - Articles by David Halperin152400
- Grist - Articles by David Halperin152401
- The Perfect Lobby: How One Industry Captured Washington, DC - The Nation 04/14152402
- Taming the for-profit college monster - Politico 08/12152403