Individual exercise: A ‘classmark’ is a set of letters and numbers assigned to a library item, allowing the item to be shelved with other items on the same topic.

Classmarks are used to locate individual items but they can also help to explore a topical area. With this in mind, conduct a search with your keywords using your library’s catalogue. Go to the relevant sections and browse through the sections you have identified as being relevant. Have you found anything useful? If not, ask your local librarian for help. Note down or save the references of all sources that appear particularly useful.