The new, ninth edition builds on the MLA's unique approach to documenting sources using a template of core elements--facts, common to most sources, like author, title, and publication date--that allows writers to cite any type of work, from books, e-books, and journal articles in databases to song lyrics, online images, social media posts, dissertations, and more.
The Purdue OWL site provides numerous examples for citing various types of publications and it includes a sample paper illustrating the proper way to format a research paper and cite sources.