(2009). Public libraries, a wise investment: A return on investment study of Colorado libraries. Colorado State Library, Library Research Service.
Chicago-Zitierstil (17. Ausg.)Public Libraries, a Wise Investment: A Return on Investment Study of Colorado Libraries. Denver, Colo: Colorado State Library, Library Research Service, 2009.
MLA-Zitierstil (9. Ausg.)Public Libraries, a Wise Investment: A Return on Investment Study of Colorado Libraries. Colorado State Library, Library Research Service, 2009.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.