| Required | Recommended |
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An
Introduction to Modern Cosmology by Andrew Liddle ISBN: 978-0470848357 |
Cosmological Physics by John Peacock ISBN: 978-0521422703 |
Another text at roughly the level of Liddle's book is Barbara Ryden's Introduction to Cosmology (ISBN: 0-8053-8912-1). Also potentially useful, though out of print, is Eric Linder's First Principles of Cosmology (ISBN: 0-201-40395-1)