introductory reference for Hopf Fibrations I am looking for a good introductory treatment of Hopf Fibrations and I am wondering whether there is a popular, well regarded, accessible book. ( I should probably say that I am just starting to learn about vector bundles. )
If anyone with more experience could point me in the right direction this would be really helpful.

These notes might also add some motivation to the topic coming in from Physics:
http://www.itp.uni-hannover.de/~giulini/papers/DiffGeom/Urbantke_HopfFib_JGP46_2003.pdf
