"California Death Index, 1905-1939," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKS9-2FNJ : 23 February 2021), Isokichi Yamaguchi, 11 Dec 1933; citing 67082, Department of Health Services, Vital Statistics Department, Sacramento; FHL microfilm 1,686,050.