This excellent online guide to MLA style covers most of the situations you're likely to encounter. Note that its table of contents is at the bottom of each page, not on the side.
The Citing sources page on Rohrbach Library’s site (linked beneath the Find Information
header on the home page) points toward many tools to help with several
citation styles as well as labor-saving bibliographic managers.
Rohrbach Library keeps several copies of the most recent MLA style manual in the Reference section. We also have the 6th edition of the MLA handbook, as well as the new 7th edition which is also reflected in the guide cited above.
Get in the habit of
collecting information about your sources as you use them. The
library's article databases will invariably supply what you need for
your citations, and many of the databases have facilities for formatting
and saving citations as well.
Citing your sources is an
essential part of your work as a member of a scholarly community.
Whenever you're unsure about the protocol and can't find a satisfactory
answer on your own, ask!