This book, the first comprehensive introduction to personalism in the past half-century, will be an invaluable resource for classroom and personal study.
Burrow's is a wonderful and extensive introduction to the philosophy of personalism, particularly from the Bostonian school. The work does tend to focus on philosophers of the Boston school, instead of their ideas or personalism in wider spheres. But that's great if that's what you're into! Personalists take personhood (or personality in an older sense) as the central reality of the world, and the key to understanding and living rightly.