1. V. Mukhanov, Physical Phoundations of Cosmology (Cambridge University Press, Cambridge, 2005)
2. R. Durrer, The Cosmic Microwave Background (Cambridge University Press, Cambridge, 2008)
3. S. Dodelson, Modern Cosmology (Elsevier, Amsterdam, 2003)
4. E.A. Milne, Kinematic Relativity (The Clarendon Press, Oxford, 1935)
5. E.A. Milne, Relativity, Gravitation and World-Structure (The Clarendon Press, Oxford, 1935)