This is a "desk book." Because the notation is so standard, you will find yourself flipping back to his definitions of the correlation function for years. How to Supplement Your Reading
Keep a separate document where you copy-paste key equations from your PDF with page numbers. loudon quantum theory of light pdf better
Read this chapter . The first time, ignore the math and focus on the physical picture. The second time, write down every commutation relation. The third time, re-derive the Hamiltonian. This is a "desk book