SpringerLink (Online service), Freksa, C., Habel, C., & Wender, K. F. (1998). Spatial Cognition: An Interdisciplinary Approach to Representing and Processing Spatial Knowledge (1st ed. 1998.). Springer Berlin Heidelberg : Imprint: Springer. https://doi.org/10.1007/3-540-69342-4
Παραπομπή σε μορφή Chicago (17η εκδ.)SpringerLink (Online service), Christian Freksa, Christopher Habel, και Karl F. Wender. Spatial Cognition: An Interdisciplinary Approach to Representing and Processing Spatial Knowledge. 1st ed. 1998. Berlin, Heidelberg: Springer Berlin Heidelberg : Imprint: Springer, 1998. https://doi.org/10.1007/3-540-69342-4.
Παραπομπή σε μορφή MLA (8th εκδ.)SpringerLink (Online service), et al. Spatial Cognition: An Interdisciplinary Approach to Representing and Processing Spatial Knowledge. 1st ed. 1998. Springer Berlin Heidelberg : Imprint: Springer, 1998. https://doi.org/10.1007/3-540-69342-4.
