EugeneR.Wittkopf, C., Jr. (2004). American foreign policy:pattern and process. 北京大学出版社.
Dyfyniad Arddull ChicagoEugeneR.Wittkopf, CharlesW.Kegley, Jr. American Foreign Policy:pattern and Process. 北京大学出版社, 2004.
Dyfyniad MLAEugeneR.Wittkopf, CharlesW.Kegley, Jr. American Foreign Policy:pattern and Process. 北京大学出版社, 2004.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.