Παραπομπή σε μορφή APA (7η εκδ.)

SpringerLink (Online service) & Zhelezov, G. (2011). Sustainable Development in Mountain Regions: Southeastern Europe. Springer Netherlands.

Παραπομπή σε μορφή Chicago (17η εκδ.)

SpringerLink (Online service) και Georgi Zhelezov. Sustainable Development in Mountain Regions: Southeastern Europe. Dordrecht: Springer Netherlands, 2011.

Παραπομπή σε μορφή MLA (8th εκδ.)

SpringerLink (Online service) και Georgi Zhelezov. Sustainable Development in Mountain Regions: Southeastern Europe. Springer Netherlands, 2011.