BBY/ABY is used to position items along the Star Wars Timeline. BBY refers to Before the Battle of Yavin. ABY refers to After the Battle of Yavin. The Battle of Yavin in Episode IV: A New Hope occured in 0 BBY/ABY.
The Youtini Expanded Universe Ranking system is a 1-5 scale that ranks EU book quality, difficulty, and importance. Books closer to Level 1 are easier to read and understand, more important, and of higher quality.
The Empire Strikes Back is a Mighty Chronicles illustrated adaptation of the 1980 film Star Wars: Episode V The Empire Strikes Back. It was published by Chronicle Books on December 1, 1996. The book contains 144 illustrations in shades of blue and black.