Não informado. (1970). Comparative group studies. Sage Publications.
Lua i Stíl Chicago (17ú heag.)Não informado. Comparative Group Studies. Beverly Hills, Calif: Sage Publications, 1970.
Lua MLA (8ú heag.)Não informado. Comparative Group Studies. Sage Publications, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.