There were loads of them ..

1- Mazhar ul haq
2- Spirit of Islam by Syed Ameer Ali
3- P.K Hitti
4- Islam from Prophet Muhammad to the capture of Constantinople
5- History of medieval Islam by Saunders (Staunch and baseless critic of Islam, I do not recommend to study him .. It was hard for me to recover from what I read of him)
6- History of Muslim Philosophy by MM Sharif
7- Spanish Islam by Dozy
8- Preaching of Islam by Thomas Arnold
9- Hundred Great Muslims
10- And watched all documentaries that I've mentioned in posts

PS: No one here needs to study all these books for IHC preparation .. Only the handful books I have mentioned in other posts of this thread will be sufficient for extra-ordinary marks in this subject .. My background in medicine and law helped me to jump to and study only the relevant portions from these books without wasting much time on irrelevant details .. So, I merely tasted some books, swallowed some and then chewed and digested thoroughly the remaining books ..

Regards ..

__________________
You Have To Keep Breaking Your Heart Until It Opens .. !! Rumi ..