Urquidi, Victor L.
University of California Press, 1962
Buku Teks
Jimenez L., Luis Felipe
United Nations, Economic Commission for Latin America and the Carbbean, 1998
Buku Teks
Liu, Shia-Ling, author
Kuang Lu Publishing , 1988
Buku Teks
Westview Press, 1988
Buku Teks
Buku Teks