Παραπομπή APA

Boyce,David E, & Nijkamp,Peter. (1991). Regional science: Retrospect and prospect. Spinger - Verlag.

Παραπομπή Chicago Style

Boyce,David E, και Nijkamp,Peter. Regional Science: Retrospect and Prospect. Berlin: Spinger - Verlag, 1991.

Παραπομπή MLA

Boyce,David E, και Nijkamp,Peter. Regional Science: Retrospect and Prospect. Spinger - Verlag, 1991.