Dyfyniad APA

U.S.Office of Education. (1971). Educaton Directory. State Government.

Dyfyniad Arddull Chicago

U.S.Office of Education. Educaton Directory. Washington: State Government, 1971.

Dyfyniad MLA

U.S.Office of Education. Educaton Directory. State Government, 1971.

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