Não informado. (1920). Quarterly Publications of the American Statistical Association. American Statistical Association.
Lua i Stíl Chicago (17ú heag.)Não informado. Quarterly Publications of the American Statistical Association. Boston, Mass: American Statistical Association, 1920.
Lua MLA (8ú heag.)Não informado. Quarterly Publications of the American Statistical Association. American Statistical Association, 1920.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.