Here are some dictionary and encyclopedia sources that you can turn to if you need to find out more about a term or concept quickly.
The call number for Early Childhood Education is 372.21 or LB1139.35. Browsing the SSHEL Stacks or Main Stacks in this range could help you find sources.
Print resources are an excellent place to start your research. These books will provide some basic biographical information about the figures you're researching, as well as references to more complete biographies. These are all located in the SSHEL reference collection. If you need help finding any of them, just ask at the reference desk!