Stimson, J. Frank
Martinus Nijhoff, 1964
Buku Referensi
Kennedy, Robert, 1974-
Cambridge University Press, 2017
Buku Teks
Healey, Alan
Australian National University, 1964
Buku Teks
Yavas, Mehmet S.
Blackwell Publishing, 2006
Buku Teks
Clark, John
Blackwell, 1995
Buku Teks