The Finite Element Method in Electromagnetics (IEEE Press) 3rd Edition

The printing quality of this book is so bad that some equations are hard to read. I found a cheaper version online with good printing quality.

The books is thorough and insightful, provides comprehensive coverage of advanced topics (e.g. higher-order edge vector elements, discontinuous Galerkin's method) some of which are no covered by other textbooks but scattered over numerous journal papers.

This is a classic in electromagnetics. If you are an autodidact, this book is as close as it can get to the perfect book.