United States Strategic Bombing Survey (1947). Nakajima Aircraft Company, Ltd. Corporation Report II. Washington, D.C. pp. Appendix M., pp. 40–42.{{cite book}}: CS1 maint: location missing publisher (link)
United States Strategic Bombing Survey (1947). Tachikawa Aircraft Company, Ltd. Corporation Report X. Washington, D.C. pp. Appendix J., pp. 29–30.{{cite book}}: CS1 maint: location missing publisher (link)