MLA website
The Modern Language Association (MLA) maintains a helpful website on how to use MLA citation style. For example, the link above leads to the Citations by Format guide that provides sample citations for physical books as well as electronic resources (books, journals, more).
Purdue University, MLA Formatting and Style Guide
This resource, part of Purdue University's Online Writing Lab or OWL, offers examples for the general format of MLA research papers. Ignore the interactive ads and use the menu on the left side of the webpage to navigate the contents of the site (for example, click the link for MLA Sample Paper to go directly to that section).