Most of the books I've read were in Russian, so sorry for any mispronunciation and/or mistranslation in the book and author names.
I've can recall off the top of my head the following books that dealt, directly or indirectly, with the Tsar's reign.
- "Reforms by Ivan the Terrible: essays on socio-economical history of XVI century Russian" by Zimin.
- "Ivan IV the Terrible" by Volodohin.
- "The Livonian War" by Koroliuk
- "Ivan the Terrible and his psychological condition" by Kovalyoski
- "Ivan the Terrible and Peter the Great: concept of the first Monarch" by Panchenko (not sure about the author, will check later)
- "History of the state of Russia" by Karamzin (either volume 7, or 8)
The only books that tried to view Ivan IV from a different perspective were:
- "Ivan the Terrible: Sadist or martyr" by Pronina. I cannot say I particularly enjoyed the book.
- "The truth about the first Russian Tsar: who and why tries to destroy the image of Lord Ioann Vasilyevich" by Fomin.