Remember that much of the children's literature material is housed on the 3rd floor, either in the Children's Alcove or in the Juvenile Collection. The Children's Alcove has scholarly material about Children's Literature, meaning it has encyclopedias, books, and journals. The Juvenile Collection contains actual children's book.
When you search the library's catalog look at the location - that will tell you where the item is located.
˄ Note that the encyclopedia above is in the Reference Section of the Children's Alcove.
Children's Literature journals are also in the Children's Alcove on the shelves next to the computers.