Zvaigzne, Māris, Alīda Zigmunde, and Ilze Gudro. 2018. “The Family of Indriķis Blankenburgs (1887–1944) and Architectural Projects in the Turn of the Century”. History of Engineering Sciences and Institutions of Higher Education 2 (November): 76-91. https://doi.org/10.7250/HESIHE.2018.006.