Pretty straightforward title. Looking for recommendations. I've read Kip Thorne's Black Holes and Time Warps, Einstein's Relativity, The Special and General Theory, and a few other titles, just looking for recommendations on where to go next. I've only covered Integral calculus and linear algebra, so I might be able to glean some mathematics though most will be beyond me. I did very much enjoy all the qualitative/descriptive information I could get from a GR textbook I got from my university library, though, but life circumstances kept me from reading past the Sagnac Effect. Any suggestions?