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 White Witch is a 1987 children's book adaptation of the Star Wars Droids episode entitled "The White Witch" published by Dragon Picture Books. It is not to be confused with another adaptation of the same episode published by Random House.