Παραπομπή σε μορφή APA (7η εκδ.)

SpringerLink (Online service), Koulov, B., & Zhelezov, G. (2016). Sustainable Mountain Regions: Challenges and Perspectives in Southeastern Europe. Springer International Publishing : Imprint: Springer.

Παραπομπή σε μορφή Chicago (17η εκδ.)

SpringerLink (Online service), Boian Koulov, και Georgi Zhelezov. Sustainable Mountain Regions: Challenges and Perspectives in Southeastern Europe. Cham: Springer International Publishing : Imprint: Springer, 2016.

Παραπομπή σε μορφή MLA (8th εκδ.)

SpringerLink (Online service), et al. Sustainable Mountain Regions: Challenges and Perspectives in Southeastern Europe. Springer International Publishing : Imprint: Springer, 2016.