It's a book that I found in my school library in about 2007, and I really want to find it now to re-read as part of preparation for a PhD.

There were two editions of this book. One edition (possibly the newer one) had a mostly yellow cover with red and black on the front; the other edition was mostly black with four portraits in a grid on the front, the portraits were Bismarck, Hitler, and two other people.

The title was something fairly generic like "The History of Germany", but I've tried searching for that and haven't found anything that looks like the right book.

Does anyone know what this book might have been? And failing that, are there any books you would recommend for a general overview of German history?

Edit: I found it! It's A History of Germany 1815 - 1990, William Carr, 1991. https://books.google.co.nz/books/about/A_History_of_Germany_1815_1990.html?id=4RycuAAACAAJ&redir_esc=y