RefME is a free reference manager that works as an add-on to a desktop browser and also as a mobile app. It is available as an app for iOS and Android. With the apps you can scan barcodes of books or search for references and then add them to your account.
It also works with Google Chrome Browser. This app and browser plugin will help you capture (from pubmed or any other web page where you have a potential reference) and manage references to go into your thesis. Once you’ve captured your references and used them in your thesis you can then export all references in the proper format (Harvard is probably the best format) and copy and paste them into your thesis.
You can sign up with a google or facebook account plus it’s completely free. More info can be found at the link below and I’ll put together a short video on how to use it later this week.