Lakos, Amos
Westview Press, 1989
Buku Referensi
Schiavone, Giuseppe
Macmillan Reference, 1997
Buku Referensi
Moran, Robert T.
Gulf, 1991
Buku Teks
West Publishing Company, 1989
Buku Teks
Kenneth W. Abbott, Philipp Genschel, Duncan Snidal, Bernhard Zangl, editors
Cambrigde University Press , 2015
Buku Teks