Kārlis Ulmanis (English Wikipedia)

Klimantas, Adomas; Norkus, Zenonas; Markevičiūtė, Jurgita; Grytten, Ola Honningdal; Šiliņš, Jānis (2023). "Reinventing perished "Belgium of the East": new estimates of GDP for inter-war Latvia (1920–1939)". Cliometrica. doi:10.1007/s11698-023-00275-y. ISSN 1863-2513. S2CID 261218861.
Roberts, Geoffrey (1995). "Soviet policy and the Baltic States, 1939–1940: a reappraisal". Diplomacy & Statecraft. 6 (3): 672–700. doi:10.1080/09592299508405982.

dv8ation.blogspot.com

Purs, Aldis (2002). "The Price of Free Lunches: Making the Frontier Latvian in the Interwar Years" (PDF). The Global Review of Ethnopolitics. Archived from the original (PDF) on 2016-03-04.

"1936 Chamber of Commerce list" (in Latvian). Latvian chamber of commerce and industry. 1936. p. 295. Archived from the original on 21 April 2019. Retrieved 22 August 2019.

"The graduates get diplomas". Lincoln, Nebraska: The Lincoln Star. 24 April 1908. Retrieved 10 October 2021.

Ulmanis, Kārlis. "Valsts Prezidenta Dr Kārla Ulmaņa norādījumi tautai". periodika.lv. LATVIJAS NACIONĀLĀ DIGITĀLĀ BIBLIOTĒKA. Retrieved 5 October 2021.

Simeon, Ute Luise. "The "Naier idisher teater" in Riga/Latvia": 6. Retrieved 6 July 2019. {{cite journal}}: Cite journal requires |journal= (help)

"Nebraska State Historical Society" (PDF). Nebraska State Historical Society. Archived from the original on 2017-09-19. Retrieved 3 April 2018.{{cite web}}: CS1 maint: unfit URL (link)
(in Latvian) Resolution of Five senators of Senate of Latvia on validity of Constitution of Latvia and authority of Saeima in conditions of occupation Archived 2007-02-24 at the Wayback Machine. Retrieved 24 December 2006.
"BNL viewer". Archived from the original on 2017-12-03. Retrieved 2017-06-02.
"1936 Chamber of Commerce list" (in Latvian). Latvian chamber of commerce and industry. 1936. p. 295. Archived from the original on 21 April 2019. Retrieved 22 August 2019.
Purs, Aldis (2002). "The Price of Free Lunches: Making the Frontier Latvian in the Interwar Years" (PDF). The Global Review of Ethnopolitics. Archived from the original (PDF) on 2016-03-04.

Bērziņš, Valdis, ed. (2003). 20. gadsimta Latvijas vēsture II: Neatkarīgā valsts 1918–1940 (in Latvian). Riga: Latvijas Vēstures institūta apgāds. ISBN 9984-601-18-8. OCLC 45570948.
Klimantas, Adomas; Norkus, Zenonas; Markevičiūtė, Jurgita; Grytten, Ola Honningdal; Šiliņš, Jānis (2023). "Reinventing perished "Belgium of the East": new estimates of GDP for inter-war Latvia (1920–1939)". Cliometrica. doi:10.1007/s11698-023-00275-y. ISSN 1863-2513. S2CID 261218861.