APA (7th ed.) Citation

Freksa, C. (1990). Qualitative spatial reasoning. Inst. für Informatik.

Chicago Style (17th ed.) Citation

Freksa, Christian. Qualitative Spatial Reasoning. München: Inst. für Informatik, 1990.

MLA (9th ed.) Citation

Freksa, Christian. Qualitative Spatial Reasoning. Inst. für Informatik, 1990.

Warning: These citations may not always be 100% accurate.