Não informado. (1981). Systems and control letters. Elsevier Science Publishers.
Lua i Stíl Chicago (17ú heag.)Não informado. Systems and Control Letters. Amsterdam: Elsevier Science Publishers, 1981.
Lua MLA (8ú heag.)Não informado. Systems and Control Letters. Elsevier Science Publishers, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.