Cita APA (7a ed.)

Beckmann, M., & Puu, T. (1985). Spatial economics: Densisty, potential and flow. North-Holland.

Cita Chicago Style (17a ed.)

Beckmann, Martin, y Tony Puu. Spatial Economics: Densisty, Potential and Flow. Amsterdam: North-Holland, 1985.

Cita MLA (9a ed.)

Beckmann, Martin, y Tony Puu. Spatial Economics: Densisty, Potential and Flow. North-Holland, 1985.