As a student of Online Astronomy Society Academy you get pretty much all you need, including
Hardcopy of the textbook
24/7 access to the portal
access to a digital copy of the textbook
Access to digital interactives and quizzes
access to a revision room
There is a bibliography which is OPTIONAL, not essential as we believe the internet is a great access. However we do have a list of useful sites and publications you might want to subscribe to.