Não informado. (1968). Modern data products, systems, services. Modern Data Services.
Lua i Stíl Chicago (17ú heag.)Não informado. Modern Data Products, Systems, Services. Framingham, Mass: Modern Data Services, 1968.
Lua MLA (8ú heag.)Não informado. Modern Data Products, Systems, Services. Modern Data Services, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.