Não informado. (1969). Journal of systems management. Association for Systems Management.
Lua i Stíl Chicago (17ú heag.)Não informado. Journal of Systems Management. Cleveland, Ohio: Association for Systems Management, 1969.
Lua MLA (8ú heag.)Não informado. Journal of Systems Management. Association for Systems Management, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.