︠I︡Udovich, ︠. Ė. (1981). Regionalʹna︠i︡a geokhimi︠i︡a osadochnykh tolshch. "Nauka," Leningradskoe otd-nie.
Chicago Style (17th ed.) Citation︠I︡Udovich, ︠I︡Akov Ėlʹevich. Regionalʹna︠i︡a Geokhimi︠i︡a Osadochnykh Tolshch. Leningrad: "Nauka," Leningradskoe otd-nie, 1981.
MLA (8th ed.) Citation︠I︡Udovich, ︠I︡Akov Ėlʹevich. Regionalʹna︠i︡a Geokhimi︠i︡a Osadochnykh Tolshch. "Nauka," Leningradskoe otd-nie, 1981.
Warning: These citations may not always be 100% accurate.