Some online guides for MLA style:
Purdue Online Writing Lab Guide—Detailed overview of all aspects of writing and citing in MLA style
Concordia University MLA Guide—Straightforward examples of how to cite different types of sources
The 2016 hardcopy MLA Handbook for Writers of Research Papers details citing sources and writing in MLA style and is available in the library:
Reading Like a Writer (a Guide for People Who Love Books and for Those Who Want to Write About Them)
Reading Critically, Writing Well: A Reader and Guide
Classical Rhetoric for the Modern Student
Office Of Assertion: An Art Of Rhetoric For Academic Essay
Oxford Paperback Thesaurus
Oxford Dictionary of Quotations
The Oxford Dictionary of American Usage and Style