Woodward, Ralph Lee, author
Central America: a nation divided
Oxford University Press , 1985
 Buku Referensi
Central America : the future of economic integration / edited by George Irvin and Stuart Holland
Westview Press , 1989
 Buku Teks
Churchill, Anthony, author
Road user charges in central America
The Johns Hopkins University , 1972
 Buku Teks
Taxes and tax harmonization in central America / Virginia G. Watkin
The Law School of Harvard University, 1967
 Buku Teks
Busey, James L., author
Latin America: political institutions and processes
Random House, 1968
 Buku Teks
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