World geographical encyclopedia 2: The Americas
edited by Sybil P. Parker
McGraw-HIll, 1995
 Buku Referensi
Regional encyclopedia of business and management : management in Asia Pacific
edited by Malcolm Warner
Business Press, 2000
 Buku Referensi
Regional encyclopedia of business and management: management in Europe
edited by Malcolm Warner
Business Press, 2000
 Buku Referensi
Regional encyclopedia of business and management : management in emerging countries
edited by Malcolm Warner
Business Press, 2000
 Buku Referensi
Morris, Michael A
Language politics of regional integration : cases from the Americas
Palgrave Macmillan, 2016
 Buku Teks