Zotero

References can be organised into ‘Collections’, another name for folders, and sub-collections. Collections are displayed in the left pane of the Zotero library.

You can organise your references by putting them into folders called Collections, rather like organising your files in 'My Computer' or your emails. You can also build multiple levels of collections in a hierarchical structure. 

To create a new collection:

• Right click on My Library or click on the Folder icon at the top of the left pane
• Select New Collection

A new dialogue box will appear:

• Give a name to the new collection, then click on Create collection. In this way Zotero will create a new collection under My Library and you will see the new collection in the left pane.
• Alternatively you can create a sub-collection: click on the little arrow down next to My Library and you will see a list of existing collections, if you have any, you can add the new collection to.

To add references to a collection:

• Select one or more references from My Library.
• Drag and drop them in the collection you want. This will create a copy of the reference(s) in the collection while the original reference will remain in My Library.
• Or Select one or more references from My Library right click and Add the references to the collection of your choice. You can also create a brand new collection.

Remember: if you remove a reference from a collection you will still have the original in My Library, but if you remove a reference from My Library, it will also remove it from any collections to which it has been added.