Referências Bibliográficas
- Introduction to Modern Astrophysics, B.W. Carrol & D. A. Ostlie
- Galaxies and Galactic Structure, D.M. Elmegreen
- Galaxies in the Universe, An Introduction, L.S. Sparke
- Galactic Astronomy: Structure and Kinematics of Galaxies, D. Mihalas & J. Binney