Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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