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শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিInstitut so︠t︡sialʹno-ėkonomicheskikh problem (Akademi︠i︡a nauk SSSR), B. S. Zhikharevich, এবং Oleg Petrovich Litovka. Razvitie Regiona: ︠t︡seli, Problemy, Perspektivy : Na Primere Severo-Zapadnogo ėkonomicheskogo Raĭona. Leningrad: "Nauka," Leningradskoe otd-nie, 1989.
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