APA (7th ed.) Citation

Zimmermann, K., & Freksa, C. (1994). Qualitative spatial reasoning using orientation, distance, and path knowledge (Rev. version.). GrKK.

Chicago Style (17th ed.) Citation

Zimmermann, Kai, and Christian Freksa. Qualitative Spatial Reasoning Using Orientation, Distance, and Path Knowledge. Rev. version. Hamburg: GrKK, 1994.

MLA (9th ed.) Citation

Zimmermann, Kai, and Christian Freksa. Qualitative Spatial Reasoning Using Orientation, Distance, and Path Knowledge. Rev. version. GrKK, 1994.