Zotero

You can sort your items into different folders by clicking the yellow folder with the green + button in the top left-hand corner. This is handy for putting items relating to the same project or topic together. When you add an item to a collection it also makes a copy of it in the main Zotero library (they are unsorted in the main library). 

• Items can be assigned tags.
• Tags are named by the user.
• An item can be assigned as many tags as is needed.
• Tags are added or removed with the tag selector at the bottom of the left column or through the Tags tab of any item in the right column.
• Up to 6 tags can be assigned colours and numbers.
• Numbered tags can be quickly added or removed using the corresponding number keys on your keyboard.

All references are automatically deposited in "My Library" (your main Zotero Library).

To remove a reference from My Library: If you remove a reference from My Library it will be deleted from all the other folders/collections.

To remove a reference from a particular folder (the citation will still be in your main Zotero Library)

• Select the folder
• Select the citation you wish to delete
• Press the delete key on your keyboard OR right-click and select Remove from Collection