Dyfyniad APA

(1970). Perspective on our time: Issues and essays. Houghton Mifflin.

Dyfyniad Arddull Chicago

Perspective on Our Time: Issues and Essays. Boston: Houghton Mifflin, 1970.

Dyfyniad MLA

Perspective on Our Time: Issues and Essays. Houghton Mifflin, 1970.

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