Hirsh, S. (2015). Information services today: An introduction. Rowman & Littlefield.
Lua i Stíl Chicago (17ú heag.)Hirsh, Sandra. Information Services Today: An Introduction. Lanham: Rowman & Littlefield, 2015.
Lua MLA (9ú heag.)Hirsh, Sandra. Information Services Today: An Introduction. Rowman & Littlefield, 2015.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.