Originally Posted by Abdul Mateen Sindhu

I studied and again studying these books according to my topic basis. If I found one topic in Joshua's book and the same one in Bayli's too. I would prefer the one whom is latest in edition.
I would (sincerely) recommend you to consult Goldstein's (international relations) and Andrew Heywood's (global politics). Then, if some topics left consult the other books mentioned above or post again in this thread.
Stay blessed