The Soils of Bulgaria

MLA

Shishkov, Toma, N Kolev, and Nikola Kolev. The Soils of Bulgaria. Springer Netherlands, 2014.

APA

Shishkov, T., & Kolev, N., & Kolev, N. (2014). The Soils of Bulgaria. Springer Netherlands.

Chicago

Shishkov, Toma, N Kolev, and Nikola Kolev. The Soils of Bulgaria. : Springer Netherlands, 2014.