Extended Foundation series

• ✔ Prelude to Foundation
• Forward the Foundation
• ✔ Foundation's Edge
• ✔ Foundation and Earth

Foundation trilogy

• ✔ Foundation
• ✔ Foundation and Empire
• ✔ Second Foundation

The Robot series

• ✔ The Caves of Steel
• The Naked Sun
• The Robots of Dawn
• Robots and Empire

Others

• ✔ The End of Eternity
• Nemesis
• The Caves of Steel
• ✔ The Gods Themselves