LOOKING FOR SOURCE

I’m currently writing a research thesis regarding George Pattons rerouting of the Seventh Army in Sicily in 1943. His chief of staff at the time was Hobart Gay and I’m told he had a diary during this time. I think his diary will hold some valuable information but I can’t find evidence it exists anywhere but I’ve heard it exists multiple times. I’m told that this is its title “With Patton's Army: The Diary of Colonel Hobart D. Gay, 1943-1945.” If anyone could point me in the right direction or even find it that would be so helpful to me. Thank you