SpringerLink (Online service) & Zhelezov, G. (2011). Sustainable development in mountain regions: Southeastern Europe. Springer Netherlands.
Cita Chicago (17th ed.)SpringerLink (Online service) i Georgi Zhelezov. Sustainable Development in Mountain Regions: Southeastern Europe. Dordrecht: Springer Netherlands, 2011.
Cita MLA (9th ed.)SpringerLink (Online service) i Georgi Zhelezov. Sustainable Development in Mountain Regions: Southeastern Europe. Springer Netherlands, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.