From the Preface: "A to Zoo can be used to obtain information about children's picture books in two ways: to learn the titles, authors, and illustrators of books on a particular subject, such as 'dragons' or 'weddings'; or to ascertain the subject (or subjects) when only the title, author and title, or illustrator and title are known." Now in its seventh edition, this is a standard reference source for picture books.
JSTOR is a database consisting of full-text articles from scholarly, peer-reviewed journals from nearly every discipline taught at Calvin. Coverage for each journal begins with the first volume, with coverage ending for most titles three and five years ago. A growing number of journals now have coverage up to the present!