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Lua i Stíl Chicago (17ú heag.)Institut pochvovedeni︠i︡a i agrokhimii (Akademi︠i︡a nauk SSSR) agus Roman Viktorovich Kovalev. Geografi︠i︡a, Plodorodie, Bonitirovka Pochv Zapadnoĭ Sibiri. Novosibirsk: "Nauka," Sibirskoe otd-nie, 1984.
Lua MLA (8ú heag.)Institut pochvovedeni︠i︡a i agrokhimii (Akademi︠i︡a nauk SSSR) agus Roman Viktorovich Kovalev. Geografi︠i︡a, Plodorodie, Bonitirovka Pochv Zapadnoĭ Sibiri. "Nauka," Sibirskoe otd-nie, 1984.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.