Ward, E. J. (1917). The social center. D. Appleton and company.
Lua i Stíl Chicago (17ú heag.)Ward, Edward Joshua. The Social Center. New York and London: D. Appleton and company, 1917.
Lua MLA (9ú heag.)Ward, Edward Joshua. The Social Center. D. Appleton and company, 1917.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.