Episode V: The Empire Strikes Back novelization by Donald F. GlutBased on the movie script and written while the film was still in production, this is the original adaptation of The Empire Strikes Back from 1980. It closely follows the plot of the movie, but with some small differences (such as a "blue" Yoda) due to the fact that author Donald F. Glut didn't get to see the movie before writing the book.
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This is a movie novelization from the Legends timeline. Though the movie itself is canon, original content in the book could be contradicted by future books, movies, or TV shows (if so, you can think of it as an alternate universe).