Start with searching for articles in Summon then try these more specialized resources.
Many significant primary source collections are avialable from the Free Library of Philadelphia. Drexel students and faculty are eligible for library cards from the FLP. Library card number and PIN are needed for remote access. Some resources are only available onsite at the FLP's Central Library.
Print copies of the MLA Handbook, 8th edition are available at W.W. Hagerty Library.
Print copies of the MLA Style Manual and Guide to Scholarly Publishing, 3rd edition are available at W.W. Hagerty Library.