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3. A. M. Adzhiev, M. A. Balamirzoev, E. M.-R. Mirzoev, et al., Soil Resources of Dagestan, Their Protection, and Rational Use (Makhachkala, 1998) [in Russian].
4. B. A. Akaev and Z. V. Ataev, et al., Physical Geography of Dagestan (Vysshaya Shkola, Moscow, 1996) [in Russian].
5. Z. V. Ataev, “Physico-Geographical Regions,” in Physical Geography of Dagestan (Vysshaya Shkola, Moscow, 1996), pp. 336–347 [in Russian].