Παραπομπή APA

Berelson, B. (1969). Population: Challenging World Crisis. Voice of America.

Παραπομπή Chicago Style

Berelson, Bernard. Population: Challenging World Crisis. Washington: Voice of America, 1969.

Παραπομπή MLA

Berelson, Bernard. Population: Challenging World Crisis. Voice of America, 1969.