Cita APA

U.S. Bureau of the Census. (1951). Census of manufactures, 1949, Purto Rico. s.n.

Citación estilo Chicago

U.S. Bureau of the Census. Census of Manufactures, 1949, Purto Rico. Washington: s.n, 1951.

Cita MLA

U.S. Bureau of the Census. Census of Manufactures, 1949, Purto Rico. s.n, 1951.