Zotero: The Tri-College Libraries recommend Zotero, a free tool that can format your bibliography, keep your citations organized, and even save your articles in the cloud so you can access them later from the library, home, or a cafe. See the Tri-College Guide to Zotero for more details.
Any librarian will be happy to give you a tour or a few pointers of the software.
MLA Format for In-Text Citations
The control of food determines how a person views his or her government (Standage).
"Half the expense of the diet went on grain, 35 per cent on animal products, and the rest on potatoes" (Clarkson 63).
"There would seem therefore to be no doubt that the type of potato plant which reached Western Europe at the end of the sixteenth century must have been much like the types we now know were common in England prior to the latter half of the seventeenth century" (Salaman 618–619).