JERMAKOVA, NADEŽDA. “A PERSONAL LIBRARY OF KARL GOTTFRIED HAGEN, PROFESSOR OF KONIGSBERG UNIVERSITY (1749–1829) (in Russian)”. Knygotyra 64 (January 1, 2015): 88–113. Accessed November 26, 2025. https://www.zurnalai.vu.lt/knygotyra/article/view/8216.