Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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