Publication Manual of the American Psychological Association by 
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Standage (2009) claims that the control of food determines how a person views his or her government.
There are few examples of historians who study a family before and after they immigrate to America (Anbinder, 2002).
"Half the expense of the diet went on grain, 35 per cent on animal products, and the rest on potatoes" (Clarkson, 2001, p. 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, p. 618-619).
References
Anbinder, T. (2002). From famine to five points: Lord Lansdowne’s Irish tenants encounter North America’s most notorious slum. The
American Historical Review, 107(2), 351–387. http://www.historycooperative.org/
Cayton, A. R. L. (2003). Insufficient woe: Sense and sensibility in writing nineteenth-century history. Reviews in American History,
31(3), 331–341. http://muse.jhu.edu/journals/reviews_in_american_history/
Clarkson, L. A. (2001). Feast and famine: food and nutrition in Ireland, 1500-1920. Oxford University Press.
Nally, D. (2008). “That coming storm”: The Irish poor law, colonial biopolitics, and the great famine. Annals of the Association of
American Geographers, 98(3), 714–741. http://www.tandfonline.com/
Reader, J. (2009). Potato: A history of the propitious esculent. Yale University Press.
Salaman, R. N. (1970). The history and social influence of the potato. Cambridge University Press.
Standage, T. (2009). An edible history of humanity (1st U.S. ed.). Walker & Co.
