Combs, J. A., & Combs, A. G. (1997). The history of American foreign policy (2nd ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Combs, Jerald A., agus Arthur G. Combs. The History of American Foreign Policy. 2nd ed. New York: McGraw-Hill, 1997.
Lua MLA (8ú heag.)Combs, Jerald A., agus Arthur G. Combs. The History of American Foreign Policy. 2nd ed. McGraw-Hill, 1997.
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