︠I︡Udovich, ︠. Ė., Ketris, M. P., Mer︠t︡s, A. V., & Mineev, D. A. (1985). Ėlementy-primesi v iskopaemykh ugl︠i︡akh. Izd-vo "Nauka," Leningradskoe otd-nie.
Lua i Stíl Chicago (17ú heag.)︠I︡Udovich, ︠I︡Akov Ėlʹevich, M. P. Ketris, A. V. Mer︠t︡s, agus Dmitriĭ Andreevich Mineev. Ėlementy-primesi V Iskopaemykh Ugl︠i︡akh. Leningrad: Izd-vo "Nauka," Leningradskoe otd-nie, 1985.
Lua MLA (8ú heag.)︠I︡Udovich, ︠I︡Akov Ėlʹevich, et al. Ėlementy-primesi V Iskopaemykh Ugl︠i︡akh. Izd-vo "Nauka," Leningradskoe otd-nie, 1985.
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