HALLAS-MURULA, Karin. Eugen Habermann (1884–1944) and Herbert Johanson (1884–1964) – from Studies at Riga Polytechnic Institute to the Top of Estonian Architecture. History of Engineering Sciences and Institutions of Higher Education, Riga, Latvia, v. 6, p. 35–55, 2022. DOI: 10.7250/HESIHE.2022.003. Disponível em: https://hesihe-journals.rtu.lv/hesihe/article/view/HESIHE.2022.003.. Acesso em: 6 mar. 2026.