Παραπομπή σε μορφή APA (7η εκδ.)

GUNNARSSON, J. (1977). Production Systems and hierarchies of centres: The relationship between spatial and economic structures. Martinus Nijhoff.

Παραπομπή σε μορφή Chicago (17η εκδ.)

GUNNARSSON, Jan. Production Systems and Hierarchies of Centres: The Relationship Between Spatial and Economic Structures. Leiden: Martinus Nijhoff, 1977.

Παραπομπή σε μορφή MLA (9th εκδ.)

GUNNARSSON, Jan. Production Systems and Hierarchies of Centres: The Relationship Between Spatial and Economic Structures. Martinus Nijhoff, 1977.