Astronomical Spectroscopy: An Introduction to the Atomic and Molecular Physics of Astronomical Spectra: 2 (Imperial College Press Advanced Physics Texts) Hardcover – Illustrated, 27 Oct. 2005

This book encompasses all aspects of Spectroscopy needed to study the heavens in good detail. The UCL course would not have been the same without it (I attended last year), and any student needing to have a sound knowledge in this subject area should give this a look-in.