MLA Directory of Periodicals The MLA Directory of Periodicals contains all information available on the journals and series on the bibliography's Master List of Periodicals. Over 7,100 titles are included; of these, over 4,400 are currently indexed. The entries list editorial addresses, phone numbers, fax numbers, e-mail addresses, frequency of publication, descriptions of the periodicals' scopes, circulation figures, subscription prices and addresses, advertising information, and submission guidelines. The directory also provides statistics on how many articles and book reviews the periodicals publish each year, as well as how many are submitted.