Zbib is a very clean and functional tool, ad free and best used at the end of your project, where all your web links can be added in and a quickly made Bibliography in any format can be created.  

Though Ad ridden,  the ability to  create an account and add sources as you research is excellent.  Also, other features such as note taking tools.  To avoid this:

1. Follow the access instructions (we outline in the on-boarding email)

2. Use the tool during normal school hours