Gruber, Ruth
Puerto Rico : island of promise
Hill and Wang, 1960
 Buku Teks SO
Galbraith, John Kenneth, 1908-2006
Marketing efficiency in Puerto Rico
Harvard University Press, 1955
 Buku Teks SO
Gruber, Ruth
Puerto Rico: island of promise
Hill and Wang, 1960
 Buku Teks SO
Morrison, John
This freedom
Penguin Books, 1985
 Buku Teks SO
Hanson, Earl Parker
Transformation : the story of modern Puerto Rico
Simon and Shuster, 1955
 Buku Teks SO