Não informado. General Systems Bulletin. Society for General Systems Research.
Lua i Stíl Chicago (17ú heag.)Não informado. General Systems Bulletin. Washington: Society for General Systems Research.
Lua MLA (8ú heag.)Não informado. General Systems Bulletin. Society for General Systems Research.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.