Não informado. (1969). Journal of Leisure Research. National Recreation and Park Association.
Lua i Stíl Chicago (17ú heag.)Não informado. Journal of Leisure Research. Washington: National Recreation and Park Association, 1969.
Lua MLA (8ú heag.)Não informado. Journal of Leisure Research. National Recreation and Park Association, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.