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.
Any librarian will be happy to give your a tour or a few pointers of the software.
Chicago (Author-Date) Format for In-Text Citations
Standage (2009) claims that the control of food determines how a person views his or her government.
"Half the expense of the diet went on grain, 35 per cent on animal products, and the rest on potatoes" (Clarkson 2001, 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 1970, 618-619).
For further illustration, see the Chicago (Author-Date) sample paper from the Purdue Online Writing Lab.
Anbinder, Tyler. “From Famine to Five Points: Lord Lansdowne’s Irish Tenants Encounter North America’s Most Notorious Slum.” The American Historical Review 107, no. 2 (2002): 351–387.
Cayton, Andrew R. L. “Insufficient Woe: Sense and Sensibility in Writing Nineteenth-Century History.” Reviews in American History 31, no. 3 (2003): 331–341.
Clarkson, Leslie A. Feast and Famine: Food and Nutrition in Ireland, 1500-1920. Oxford: Oxford University Press, 2001.
Nally, David. “‘That Coming Storm’: The Irish Poor Law, Colonial Biopolitics, and the Great Famine.” Annals of the Association of American Geographers 98, no. 3 (2008): 714–741.
Reader, John. Potato: a History of the Propitious Esculent. New Haven: Yale University Press, 2009.
Salaman, Redcliffe N. The History and Social Influence of the Potato. Cambridge: University Press, 1970.
Standage, Tom. An Edible History of Humanity. 1st U.S. ed. New York: Walker & Co., 2009.