Παραπομπή σε μορφή APA (7η εκδ.)

Wils, F., & Helmsing, A. H. J. (2001). Enabling communities and markets: Meanings, relationships and options in settlement improvement. ORPAS - Institute of Social Studies.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Wils, Frits, και A. H. J. Helmsing. Enabling Communities and Markets: Meanings, Relationships and Options in Settlement Improvement. The Hague: ORPAS - Institute of Social Studies, 2001.

Παραπομπή σε μορφή MLA (9th εκδ.)

Wils, Frits, και A. H. J. Helmsing. Enabling Communities and Markets: Meanings, Relationships and Options in Settlement Improvement. ORPAS - Institute of Social Studies, 2001.