Textbooks
I have written a graduate student level textbook chapter introducing the high resolution spectroscopy technique for studying exoplanet atmospheres. It is part of the Handbook of Exoplanets, and you can find here: Spectroscopic Direct Detection of Exoplanets. It is a living reference that will be periodically updated as the rapid pace of exoplanet research continues to innovate and advance on observational techniques. You can find my expanded version on arXiv.org as well here: Exoplanet Atmospheres at High Spectral Resolution.