edited by Malcolm Warner
Business Press, 2000
Buku Referensi
Washington : Pan American Union, General Secretariet of the Organization of American States
Majalah, Jurnal, Buletin
John E. Joseph
Edinburgh University Press, 2009
eBooks
edited by David N. Balaam and Michael J. Carey
Allanheld, Osmun, 1981
Buku Teks
Mcgilvray, James
Polity, 2014
Buku Teks