Heide W. Whelan, Adapting to Modernity. Family, Caste and Capitalism among the Baltic German Nobility. Zeitschrift für Ostmitteleuropa-Forschung, [S. l.], v. 49, n. 4, p. 612, 2000. DOI: 10.25627/20004947415. Disponível em: https://openjournals.osmikon.de/zfo/article/view/7415. Acesso em: 16 sep. 2026.