National Research Council (U.S.). Committee on Licensing Geographic Data and Services. (2004). Licensing geographic data and services. National Academies Press.
Chicago-referens (17:e uppl.)National Research Council (U.S.). Committee on Licensing Geographic Data and Services. Licensing Geographic Data and Services. Washington, D.C: National Academies Press, 2004.
MLA-referens (9:e uppl.)National Research Council (U.S.). Committee on Licensing Geographic Data and Services. Licensing Geographic Data and Services. National Academies Press, 2004.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.