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
Friedrich, Carl J.
Puerto Rico : middle road to freedom
Rinehart, 1959
 Buku Teks SO
Wells, Henry
The modernization of Puerto Rico: apolitical study of changing values and institutions
Harvard University Press, 1969
 Buku Teks SO