To cite the electronic portion of a textbook, follow the MLA template of core elements. Begin with the title of the material or a description of it. Then provide the name of the Web site where you accessed the material as the title of the container. Then list the name of the publisher of the Web site (if different from the site’s title), the date the material was posted (or if the post date is not given, the copyright date of the Web site), and the URL. If you wish to indicate that the work is a companion to the textbook, you can use the optional-element slot at the end of the entry to specify this fact:
Pitch package. LaunchPad, Macmillan, 2017, macmillanhighered.com/smh. Material accompanying The St. Martin’s Handbook.
Published 16 November 2017