SpringerLink (Online service) & Zhelezov, G. (2011). Sustainable development in mountain regions: Southeastern Europe. Springer Science+Business.
Cita Chicago (17th ed.)SpringerLink (Online service) i Georgi Zhelezov. Sustainable Development in Mountain Regions: Southeastern Europe. Dordrecht: Springer Science+Business, 2011.
Cita MLA (8th ed.)SpringerLink (Online service) i Georgi Zhelezov. Sustainable Development in Mountain Regions: Southeastern Europe. Springer Science+Business, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.