Harvard University. (1979). Mapping software and cartographic data bases. Harvard Library of Computer Graphics 1979 mapping collection.
Chicago-Zitierstil (17. Ausg.)Harvard University. "Mapping Software and Cartographic Data Bases." Harvard Library of Computer Graphics 1979 Mapping Collection 1979.
MLA-Zitierstil (9. Ausg.)Harvard University. "Mapping Software and Cartographic Data Bases." Harvard Library of Computer Graphics 1979 Mapping Collection, 1979.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.