Are you using books as sources? Remember that means you need to find relevant, authoritative ideas that add to what you know and understand about your topic ... and that means you can cite the book in your paper when you only use a chapter or a section. Use the Table of Contents and/or the Index to find just those most useful sections of the book.
Skim the index from A-Z. Let you eye rest on any word or phrase that seems related to your topic. This might be a direct connection or not. Check the pages to see if the text adds to your knowledge of your topic. Read a bit before and a bit after the exact page(s) listed in the index. Be thorough.
This is a sampling of the titles available in the library related to child labor domestically, in the United States. For additional titles of interest, search the library catalog
Child Labor by 
A Right to Childhood by 
Children for Hire by This is a sampling of the titles available in the library related to child labor globally. For additional titles of interest, search the library catalog.
The Role of International Law in the Elimination of Child Labor by 
Child Labour in Britain, 1750-1870 by 
Before Their Time by 
