Dyfyniad APA

U.S. Dept. of State. (1948). Department of foreign service series 1-. s.n.

Dyfyniad Arddull Chicago

U.S. Dept. of State. Department of Foreign Service Series 1-. S.l: s.n, 1948.

Dyfyniad MLA

U.S. Dept. of State. Department of Foreign Service Series 1-. s.n, 1948.

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