APA

(1966). Thirty years of change in Puerto Rico. New York: F. A. Praeger.

Chicago

1966. Thirty years of change in Puerto Rico. New York: F. A. Praeger.

Harvard

(1966). Thirty years of change in Puerto Rico. New York: F. A. Praeger.

MLA

Thirty years of change in Puerto Rico. New York: F. A. Praeger. 1966.