Não informado. (1987). Marketing library services. Learned Information.
Lua i Stíl Chicago (17ú heag.)Não informado. Marketing Library Services. Medford, NJ: Learned Information, 1987.
Lua MLA (8ú heag.)Não informado. Marketing Library Services. Learned Information, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.