Boyd, G., & Hopple, G. W. (1987). Political change and foreign policies. St. Martin's Press.
Citazione stile Chigago Style (17a edizione)Boyd, Gavin, e Gerald W. Hopple. Political Change and Foreign Policies. New York: St. Martin's Press, 1987.
Citatione MLA (9a ed.)Boyd, Gavin, e Gerald W. Hopple. Political Change and Foreign Policies. St. Martin's Press, 1987.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.