Grumbach, Jacob M.; Hacker, Jacob S.; Pierson, Paul (), Hertel-Fernandez, Alexander; Hacker, Jacob S.; Thelen, Kathleen; Pierson, Paul, ed., „The Political Economies of Red States”, The American Political Economy: Politics, Markets, and Power, Cambridge University Press, pp. 209–244, ISBN978-1316516362, arhivat din original la , accesat în
Grumbach, Jacob M.; Hacker, Jacob S.; Pierson, Paul (), Hertel-Fernandez, Alexander; Hacker, Jacob S.; Thelen, Kathleen; Pierson, Paul, ed., „The Political Economies of Red States”, The American Political Economy: Politics, Markets, and Power, Cambridge University Press, pp. 209–244, ISBN978-1316516362, arhivat din original la , accesat în