Regional encyclopedia of business and management : management in the Americas
edited by Malcolm Warner
Business Press, 2000
 Buku Referensi
Americas
Washington : Pan American Union, General Secretariet of the Organization of American States
 Majalah, Jurnal, Buletin
John E. Joseph
Language and Politics
Edinburgh University Press, 2009
 eBooks
Comparative politics in regional perspective
Thomson Wadsworth, 2003
 Multimedia
Food politics : the regional conflict
edited by David N. Balaam and Michael J. Carey
Allanheld, Osmun, 1981
 Buku Teks