Outer planets

Planets far from Earth

Ian Graham

Uranus, Neptune, & Pluto (Exploring the Solar System)

Giles Sparrow

Uranus And Neptune

Miller, Ron, Ron Miller

Satellites of the outer planets: worlds in their own right

David A. Rothery.

Seven Wonders of the Gas Giants and Their Moons

Miller, Ron

Exploring the Outer Planets

Nancy Dickmann

The Far planets

by the editors of Time-Life Books.

Far Planets

Robin Kerrod

The universe: the outer planets

Tim Goss and Geza Gyuk.

The hunt for planet X: new worlds and the fate of Pluto

Govert Schilling.