Gruber, Ruth
Puerto Rico : island of promise
Hill and Wang, 1960
 Buku Teks
Galbraith, John Kenneth, 1908-2006
Marketing efficiency in Puerto Rico
Harvard University Press, 1955
 Buku Teks
Gruber, Ruth
Puerto Rico: island of promise
Hill and Wang, 1960
 Buku Teks
Friedrich, Carl J.
Puerto Rico : middle road to freedom
Rinehart, 1959
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Wells, Henry
The modernization of Puerto Rico: apolitical study of changing values and institutions
Harvard University Press, 1969
 Buku Teks