MASSER, I. (1978). Spatial representation and spatial interaction. Martinus Nijhoff.
Chicago-viite (17. p.)MASSER, Ian. Spatial Representation and Spatial Interaction. Leiden: Martinus Nijhoff, 1978.
MLA-viite (9. p.)MASSER, Ian. Spatial Representation and Spatial Interaction. Martinus Nijhoff, 1978.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.