APA (7th ed.) Citation

Sen, A., & Smith, T. E. (1995). Gravity Models of Spatial Interaction Behavior. Springer Berlin Heidelberg.

Chicago Style (17th ed.) Citation

Sen, Ashish, and Tony E. Smith. Gravity Models of Spatial Interaction Behavior. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995.

MLA (9th ed.) Citation

Sen, Ashish, and Tony E. Smith. Gravity Models of Spatial Interaction Behavior. Springer Berlin Heidelberg, 1995.