^Japan Manchoukuo year book 1934 "Hirota, Ryutaro — Musician; b. June, 1892 in Kochi-ken; s. of Seiio Hirota, educator; m. Yuriko, d. of Saburo Takayasu. Career: grad., Tokyo Academy of Music; appointed Asst. Prof., same; was sent to Berlin for study of; piano and composition.."
^Japan Manchoukuo year book 1934 "Hirota, Ryutaro — Musician; b. June, 1892 in Kochi-ken; s. of Seiio Hirota, educator; m. Yuriko, d. of Saburo Takayasu. Career: grad., Tokyo Academy of Music; appointed Asst. Prof., same; was sent to Berlin for study of; piano and composition.."