RYAN, B. F. (1969). Social and cultural change. The Ronald Press.
Lua i Stíl Chicago (17ú heag.)RYAN, Bryce F. Social and Cultural Change. New York: The Ronald Press, 1969.
Lua MLA (9ú heag.)RYAN, Bryce F. Social and Cultural Change. The Ronald Press, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.