Waelder, R. (1967). Progress and revolution: A study of the issues of our age. International Universities Press.
Lua i Stíl Chicago (17ú heag.)Waelder, Robert. Progress and Revolution: A Study of the Issues of Our Age. New York: International Universities Press, 1967.
Lua MLA (9ú heag.)Waelder, Robert. Progress and Revolution: A Study of the Issues of Our Age. International Universities Press, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.