Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.