Foundation Series Asimov

Foundation and Empire

The Stars, Like Dust

Triangle (The Currents of Space / Pebble in the Sky / The Stars, Like Dust)

Second Foundation

1953

Foundation's Edge

1982

Foundation and Earth

1986

Novels (Foundation / Foundation and Empire / Foundation's Edge / Second Foundation)

Prelude to Foundation

1988

Foundation series 2 (Foundation and Earth / Foundation and Empire / Foundation's Edge / Second Foundation)

Foundation series 1 (Forward the Foundation / Foundation / Prelude to Foundation)