Here are a few books and movie recommendations to get you in the mood for studying global public health.
Here are three books that will give you a particularly good insight into the critical and interdisciplinary way that we teach global health at the Faculty of Medicine and Dentistry - Queen Mary University of London:
If you're keen to do some wider reading, this is an excellent list of global health related literature.
There are also plenty of films that will help you better understand global public health. This is quite a comprehensive list of documentaries and movies. Some of them can be watched free online.