SpringerLink (Online service), Bocher, E., & Neteler, M. (2012). Geospatial Free and Open Source Software in the 21st Century: Proceedings of the first Open Source Geospatial Research Symposium, OGRS 2009. Springer Berlin Heidelberg : Imprint: Springer.
Παραπομπή σε μορφή Chicago (17η εκδ.)SpringerLink (Online service), Erwan Bocher, και Markus Neteler. Geospatial Free and Open Source Software in the 21st Century: Proceedings of the First Open Source Geospatial Research Symposium, OGRS 2009. Berlin, Heidelberg: Springer Berlin Heidelberg : Imprint: Springer, 2012.
Παραπομπή σε μορφή MLA (8th εκδ.)SpringerLink (Online service), et al. Geospatial Free and Open Source Software in the 21st Century: Proceedings of the First Open Source Geospatial Research Symposium, OGRS 2009. Springer Berlin Heidelberg : Imprint: Springer, 2012.
