Birley, S. (1982). New enterprises: A start-up case book. Croom Helm.
Lua i Stíl Chicago (17ú heag.)Birley, Sue. New Enterprises: A Start-up Case Book. London: Croom Helm, 1982.
Lua MLA (8ú heag.)Birley, Sue. New Enterprises: A Start-up Case Book. Croom Helm, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.