Various publications are produced each year that contain listings of literary agents and the categories of writing they represent. Writer's Digest annually publishes their Writer's Market which contains a listing of literary agents including children's book literary agents. They also publish a directory specifically for authors looking for literary agents that represent children's literature Children's Writer's and Illustrator's Market. Another guide that many children's book authors use as a resource is the Jeff Herman's Guide to Book Publishers, Editors and Literary Agents. A new and updated version is published every year. All of these books contain specific details about literary agents such as contact information and author submission guidelines. These books also have articles on various writing genres and subjects to help educate writers. They can be purchased online or in bookstores, and some libraries have copies available as well.
You can find children's book literary agents through online resources or websites that contain listings. You can type the words "literary agent" in the search browser and you will have several websites to choose from that list literary agents that represent children's book authors. For example, WritersNet is an online source that lists agents by location and by topic. You can look up the children's literature sub heading to find links to agent websites, and you can research their agencies as well as published books they represented. Another online source that lists literary agents around the world is 1,000 Literary Agents. If you type "literary agents for children's books" in the search browser you will find listings of individual agencies that represent children's book authors.
If you attend writer's conferences and seminars for children's book authors, you may get the opportunity to meet literary agents that represent children's literature. Meeting them in person means you may get the chance to discuss your book and get a personal invitation from the agent to submit your manuscript for their review. If they are not interested in your book idea, they may be able to give you a referral to another literary agent that may want to represent you. Also, another tip for locating children's book literary agents is to look at the dedication page inside children's books to see if the agent is mentioned.