Jun Okuda, Kazumi Kawamura and Masahiro Ohsawa.From the Year 1422, Town Hall Pharmacy Still Working in Tallinn (Estonia) ─ The 598-Year History In "Revue [japonaise] d'histoire pharmaceutique" (薬史学雑誌) 55 (2),210-217(08.04.2020)[1]
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Helmi Üprus: Raidkivikunst Eestis XIII-XVII sajandini, Tallinn, 1987; p.177 [2]