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Books about Naoharu:
Ko Shimoda Naoharu Kyoju tsuito ronbunshu, shakai kozo no tankyu: Genjitsu to riron no intafeisu (Japanese Edition... (1995)
Wiki information Naoharu:
Viscount Ōsako Naoharu was a general in the early Imperial Japanese Army. He was the older brother of General Ōsako Naomichi.
Kataoka Naoharu, was an entrepreneur, politician and cabinet minister in the Empire of Japan, serving as a member of the Upper House of the Diet of Japan.