Lowi, Theodore J. (July 1972). "Four Systems of Policy, Politics, and Choice". Public Administration Review. 32 (4): 298–310. doi:10.2307/974990. JSTOR974990.
Sabatier, Paul A. (June 1991). "Toward Better Theories of the Policy Process". PS: Political Science and Politics. 24 (2): 147–156. doi:10.2307/419923. JSTOR419923. S2CID153841704.
Lowi, Theodore J. (July 1972). "Four Systems of Policy, Politics, and Choice". Public Administration Review. 32 (4): 298–310. doi:10.2307/974990. JSTOR974990.
Sabatier, Paul A. (June 1991). "Toward Better Theories of the Policy Process". PS: Political Science and Politics. 24 (2): 147–156. doi:10.2307/419923. JSTOR419923. S2CID153841704.
Sabatier, Paul A. (June 1991). "Toward Better Theories of the Policy Process". PS: Political Science and Politics. 24 (2): 147–156. doi:10.2307/419923. JSTOR419923. S2CID153841704.