Não informado. (1959). Education equipment. Benn Brothers.
Lua i Stíl Chicago (17ú heag.)Não informado. Education Equipment. London: Benn Brothers, 1959.
Lua MLA (8ú heag.)Não informado. Education Equipment. Benn Brothers, 1959.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.