Pyke, F., & Sengenberger, W. (1992). Industrial districts and local economic regeneration. International institute.
Dyfyniad Arddull ChicagoPyke, Frank, and Werner Sengenberger. Industrial Districts and Local Economic Regeneration. Geneva: International institute, 1992.
Dyfyniad MLAPyke, Frank, and Werner Sengenberger. Industrial Districts and Local Economic Regeneration. International institute, 1992.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.