Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.

APA Citation Edition Citation

Petrov, P., Velev, S., & Nikolov, B. (1990). Complex physical geographic study of the region of the town of Isperih, with elements of paleolandscape reconstruction. (Bulg.m.engl.Res.) -.

Chicago Citation Edition Citation

Petrov, P., S. Velev, und B. Nikolov. Complex Physical Geographic Study of the Region of the Town of Isperih, with Elements of Paleolandscape Reconstruction. (Bulg.m.engl.Res.) -. 1990.

MLA Citation Edition Citation

Petrov, P., et al. Complex Physical Geographic Study of the Region of the Town of Isperih, with Elements of Paleolandscape Reconstruction. (Bulg.m.engl.Res.) -. 1990.