Johnson, P. E., Aldrich, J. H., & Miller, G. J. (1990). American government: People, institutions, and policies (2nd ed.). Houghton mifflin.
Lua i Stíl Chicago (17ú heag.)Johnson, Paul E., John H. Aldrich, agus Gary J. Miller. American Government: People, Institutions, and Policies. 2nd ed. Dallas: Houghton mifflin, 1990.
Lua MLA (9ú heag.)Johnson, Paul E., et al. American Government: People, Institutions, and Policies. 2nd ed. Houghton mifflin, 1990.
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