Lua APA (7ú heag.)
Espejo, R. (2004). Tribute to Stafford Beer. Emerald Group Publishing.
Lua i Stíl Chicago (17ú heag.)
Espejo, Raul. Tribute to Stafford Beer. Bradford, West Yorkshire, England: Emerald Group Publishing, 2004.
Lua MLA (9ú heag.)
Espejo, Raul. Tribute to Stafford Beer. Emerald Group Publishing, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.