APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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