From 1942 to 1943 Riipalu was a platoon leader and company commander of the 36th Estonian Police Battalion, and became commander of the battalion in November 1942.[1]
Scherzer, Veit (2007). Die Ritterkreuzträger 1939–1945 Die Inhaber des Ritterkreuzes des Eisernen Kreuzes 1939 von Heer, Luftwaffe, Kriegsmarine, Waffen-SS, Volkssturm sowie mit Deutschland verbündeter Streitkräfte nach den Unterlagen des Bundesarchives [The Knight's Cross Bearers 1939–1945 The Holders of the Knight's Cross of the Iron Cross 1939 by Army, Air Force, Navy, Waffen-SS, Volkssturm and Allied Forces with Germany According to the Documents of the Federal Archives] (in German). Jena, Germany: Scherzers Miltaer-Verlag. ISBN978-3-938845-17-2.
Pinn, Voldemar (1999). Auvere sangar: Rüütliristi kandja kolonelleitnant Harald Riipalu [Hero of Auvere: the Knight's Cross holder Lieutenant Colonel Harald Riipalu] (in Estonian). Tallinn, Estonia.{{cite book}}: CS1 maint: location missing publisher (link)
Võsaste, Rauno (2011). Harald Riipalu lugu [The Harald Riipalu Story] (in Estonian). Tallinn, Estonia: Grenader. ISBN9789949448517.