Stuka by Alex Vanags-Baginski is one of my must haves. ISBN 0-517-54853-4 easy to find used for around $12.
Aero Detail #11 Junkers ju87D/G Stuka is out of print I think but still can be found. Even tho its on the D/G version a lot of the detail remains the same.you should be able to find a free download with a search.
Junkers Ju87 by EddieJ. Creek ISBN 978 1 90653 728 9 has a lot of photos and drawings and some color profiles.
Kagero publishing has 4 volumes out on the Ju87.vol 1 & 2 cover the earlier versions A & B models while vol 3 & 4 cover the later D/G versions.These have a lot of color profiles and some excellent 3 views.