APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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