University Microfilms International. (1988). Russian history and culture: A microfiche collection of scarce books on 19th and early 20th century Russia from the Helsinki University Library : a cumulative index to units 1-20. UMI.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)University Microfilms International. Russian History and Culture: A Microfiche Collection of Scarce Books on 19th and Early 20th Century Russia from the Helsinki University Library : A Cumulative Index to Units 1-20. Ann Arbor, Mich.: UMI, 1988.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)University Microfilms International. Russian History and Culture: A Microfiche Collection of Scarce Books on 19th and Early 20th Century Russia from the Helsinki University Library : A Cumulative Index to Units 1-20. UMI, 1988.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.